diff --git a/package-lock.json b/package-lock.json
index 1920e29..ac78d07 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "oikos",
-  "version": "1.0.0",
+  "version": "0.3.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "oikos",
-      "version": "1.0.0",
+      "version": "0.3.0",
       "license": "MIT",
       "dependencies": {
         "bcrypt": "^5.1.1",
diff --git a/package.json b/package.json
index 26acd58..6760a40 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "test:calendar": "node --experimental-sqlite test-calendar.js",
     "test:ncb": "node --experimental-sqlite test-notes-contacts-budget.js",
     "test:ux-utils": "node test-ux-utils.js",
-    "test:modal-utils": "node test-modal-utils.js",
+    "test:modal-utils": "node --loader ./test-browser-loader.mjs test-modal-utils.js",
     "test": "node --experimental-sqlite test-db.js && node --experimental-sqlite test-dashboard.js && node --experimental-sqlite test-tasks.js && node --experimental-sqlite test-shopping.js && node --experimental-sqlite test-meals.js && node --experimental-sqlite test-calendar.js && node --experimental-sqlite test-notes-contacts-budget.js && npm run test:ux-utils && npm run test:modal-utils"
   },
   "dependencies": {
diff --git a/public/components/modal.js b/public/components/modal.js
index 890d290..83e4ebd 100644
--- a/public/components/modal.js
+++ b/public/components/modal.js
@@ -4,12 +4,15 @@
  *        Focus-Restore, Scroll-Lock und aria-modal.
  *        Auf Mobile: Bottom Sheet mit Swipe-to-Close und Slide-out-Animation.
  * Abhängigkeiten: CSS-Klassen aus layout.css (.modal-overlay, .modal-panel, etc.)
+ *                 i18n.js (t)
  *
  * API:
  *   openModal({ title, content, onSave, onDelete, size }) → void
  *   closeModal() → void
  */
 
+import { t } from '/i18n.js';
+
 let activeOverlay = null;
 let previouslyFocused = null;
 let focusTrapHandler = null;
@@ -191,7 +194,7 @@ export function openModal({ title, content, onSave, onDelete, size = 'md' } = {}
            aria-labelledby="shared-modal-title">
         <div class="modal-panel__header">
           <h2 class="modal-panel__title" id="shared-modal-title">${title}</h2>
-          <button class="modal-panel__close" data-action="close-modal" aria-label="Schließen">
+          <button class="modal-panel__close" data-action="close-modal" aria-label="${t('modal.closeLabel')}">
             <i data-lucide="x" style="width:18px;height:18px" aria-hidden="true"></i>
           </button>
         </div>
diff --git a/public/components/oikos-install-prompt.js b/public/components/oikos-install-prompt.js
index 2a0d407..5b5a3ff 100644
--- a/public/components/oikos-install-prompt.js
+++ b/public/components/oikos-install-prompt.js
@@ -1,7 +1,7 @@
 /**
  * Modul: Install-Prompt Web Component
  * Zweck: Dezentes Banner für PWA-Installation (Chrome/Android) und iOS-Anleitung
- * Abhängigkeiten: Design Tokens aus tokens.css (via CSS custom properties)
+ * Abhängigkeiten: Design Tokens aus tokens.css (via CSS custom properties), i18n.js (t)
  *
  * Verhalten:
  *   - Chrome/Android: Fängt beforeinstallprompt ab, zeigt Install-Banner
@@ -11,6 +11,8 @@
  *   - Timing: Banner erst nach 2 Nutzer-Interaktionen anzeigen
  */
 
+import { t } from '/i18n.js';
+
 const DISMISS_KEY = 'oikos-install-dismissed';
 const DISMISS_DURATION_MS = 7 * 24 * 60 * 60 * 1000; // 7 Tage
 
@@ -39,6 +41,14 @@ class OikosInstallPrompt extends HTMLElement {
       return;
     }
 
+    // locale-changed: Banner neu rendern wenn Sprache wechselt
+    this._onLocaleChanged = () => {
+      if (this._currentIsIOS !== undefined) {
+        this._showBanner(this._currentIsIOS);
+      }
+    };
+    window.addEventListener('locale-changed', this._onLocaleChanged);
+
     // Noch nicht genug Interaktionen
     const interactions = Number(localStorage.getItem(INTERACTION_KEY) || '0');
     if (interactions < INTERACTION_THRESHOLD) {
@@ -56,6 +66,9 @@ class OikosInstallPrompt extends HTMLElement {
   disconnectedCallback() {
     window.removeEventListener('beforeinstallprompt', this._onBeforeInstall);
     if (this._offInteraction) this._offInteraction();
+    if (this._onLocaleChanged) {
+      window.removeEventListener('locale-changed', this._onLocaleChanged);
+    }
   }
 
   _waitForInteractions() {
@@ -97,6 +110,7 @@ class OikosInstallPrompt extends HTMLElement {
 
   /** Banner rendern */
   _showBanner(isIOS) {
+    this._currentIsIOS = isIOS;
     this._shadow.innerHTML = '';
 
     const style = document.createElement('style');
@@ -242,7 +256,7 @@ class OikosInstallPrompt extends HTMLElement {
 
     const title = document.createElement('div');
     title.className = 'title';
-    title.textContent = 'Oikos installieren';
+    title.textContent = t('install.title');
 
     const subtitle = document.createElement('div');
     subtitle.className = 'subtitle';
@@ -251,12 +265,12 @@ class OikosInstallPrompt extends HTMLElement {
       // iOS: Teilen-Icon als SVG inline
       subtitle.innerHTML = '';
       subtitle.append(
-        document.createTextNode('Tippe auf '),
+        document.createTextNode(t('install.iosTip1')),
         this._createShareIcon(),
-        document.createTextNode(' → „Zum Home-Bildschirm"')
+        document.createTextNode(t('install.iosTip2'))
       );
     } else {
-      subtitle.textContent = 'Zur App hinzufügen';
+      subtitle.textContent = t('install.subtitle');
     }
 
     text.appendChild(title);
@@ -267,7 +281,7 @@ class OikosInstallPrompt extends HTMLElement {
     if (!isIOS) {
       const btn = document.createElement('button');
       btn.className = 'btn-install';
-      btn.textContent = 'Installieren';
+      btn.textContent = t('install.installButton');
       btn.addEventListener('click', () => this._onInstallClick());
       banner.appendChild(btn);
     }
@@ -275,7 +289,7 @@ class OikosInstallPrompt extends HTMLElement {
     // Dismiss-Button
     const dismiss = document.createElement('button');
     dismiss.className = 'btn-dismiss';
-    dismiss.setAttribute('aria-label', 'Schließen');
+    dismiss.setAttribute('aria-label', t('install.dismissLabel'));
     dismiss.innerHTML = `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>`;
     dismiss.addEventListener('click', () => this._dismiss());
     banner.appendChild(dismiss);
diff --git a/public/components/oikos-locale-picker.js b/public/components/oikos-locale-picker.js
new file mode 100644
index 0000000..bc9d411
--- /dev/null
+++ b/public/components/oikos-locale-picker.js
@@ -0,0 +1,80 @@
+/**
+ * oikos-locale-picker — Sprachauswahl-Web-Component
+ * Zeigt Radio-Buttons für System/Deutsch/English.
+ * Bei Auswahl: setLocale() oder localStorage-Eintrag löschen (System).
+ * Dependencies: i18n.js
+ */
+
+import { t, setLocale, getLocale, getSupportedLocales } from '/i18n.js';
+
+const LOCALE_LABELS = {
+  de: 'Deutsch',
+  en: 'English',
+};
+
+class OikosLocalePicker extends HTMLElement {
+  connectedCallback() {
+    this._render();
+    this._onLocaleChanged = () => this._render();
+    window.addEventListener('locale-changed', this._onLocaleChanged);
+  }
+
+  disconnectedCallback() {
+    window.removeEventListener('locale-changed', this._onLocaleChanged);
+  }
+
+  _render() {
+    this.textContent = '';
+
+    const stored = localStorage.getItem('oikos-locale');
+
+    const wrapper = document.createElement('div');
+    wrapper.className = 'locale-picker';
+
+    // System-Option
+    const systemOption = this._createOption(
+      'system',
+      t('settings.localeSystem'),
+      !stored,
+      () => {
+        localStorage.removeItem('oikos-locale');
+        location.reload();
+      }
+    );
+    wrapper.appendChild(systemOption);
+
+    // Sprach-Optionen
+    for (const locale of getSupportedLocales()) {
+      const option = this._createOption(
+        locale,
+        LOCALE_LABELS[locale] || locale,
+        stored === locale,
+        () => setLocale(locale)
+      );
+      wrapper.appendChild(option);
+    }
+
+    this.appendChild(wrapper);
+  }
+
+  _createOption(value, label, checked, onChange) {
+    const item = document.createElement('label');
+    item.className = 'locale-picker__option';
+
+    const radio = document.createElement('input');
+    radio.type = 'radio';
+    radio.name = 'locale';
+    radio.value = value;
+    radio.checked = checked;
+    radio.addEventListener('change', onChange);
+
+    const span = document.createElement('span');
+    span.textContent = label;
+
+    item.appendChild(radio);
+    item.appendChild(span);
+    return item;
+  }
+}
+
+customElements.define('oikos-locale-picker', OikosLocalePicker);
diff --git a/public/i18n.js b/public/i18n.js
new file mode 100644
index 0000000..5c45e41
--- /dev/null
+++ b/public/i18n.js
@@ -0,0 +1,108 @@
+/**
+ * i18n — Internationalisierung / Übersetzungsmodul
+ * Bietet t(), initI18n(), setLocale(), getLocale(), getSupportedLocales(),
+ * formatDate(), formatTime() für die gesamte App.
+ * Dependencies: none (vanilla JS, Fetch API, Intl API)
+ */
+
+const SUPPORTED_LOCALES = ['de', 'en'];
+const DEFAULT_LOCALE = 'de';
+const STORAGE_KEY = 'oikos-locale';
+
+let currentLocale = DEFAULT_LOCALE;
+let translations = {};
+let fallbackTranslations = {};
+
+/** Resolve locale: manual override > navigator.language > default */
+function resolveLocale() {
+  const stored = localStorage.getItem(STORAGE_KEY);
+  if (stored && SUPPORTED_LOCALES.includes(stored)) return stored;
+
+  const browserLocales = navigator.languages || [navigator.language];
+  for (const tag of browserLocales) {
+    const base = tag.split('-')[0].toLowerCase();
+    if (SUPPORTED_LOCALES.includes(base)) return base;
+  }
+  return DEFAULT_LOCALE;
+}
+
+/** Lade eine Locale-JSON-Datei */
+async function loadLocale(locale) {
+  const resp = await fetch(`/locales/${locale}.json`);
+  if (!resp.ok) throw new Error(`Failed to load locale: ${locale}`);
+  return resp.json();
+}
+
+/** Initialisierung — einmal beim App-Start aufrufen */
+export async function initI18n() {
+  currentLocale = resolveLocale();
+  fallbackTranslations = await loadLocale(DEFAULT_LOCALE);
+  if (currentLocale !== DEFAULT_LOCALE) {
+    try {
+      translations = await loadLocale(currentLocale);
+    } catch {
+      translations = fallbackTranslations;
+      currentLocale = DEFAULT_LOCALE;
+    }
+  } else {
+    translations = fallbackTranslations;
+  }
+  document.documentElement.lang = currentLocale;
+}
+
+/** Sprache wechseln — löst 'locale-changed' Event aus */
+export async function setLocale(locale) {
+  if (!SUPPORTED_LOCALES.includes(locale)) return;
+  localStorage.setItem(STORAGE_KEY, locale);
+  currentLocale = locale;
+  const loaded = locale === DEFAULT_LOCALE
+    ? fallbackTranslations
+    : await loadLocale(locale);
+  if (currentLocale !== locale) return;
+  translations = loaded;
+  document.documentElement.lang = locale;
+  window.dispatchEvent(new CustomEvent('locale-changed', { detail: { locale } }));
+}
+
+/** Übersetzungsfunktion mit Platzhalter-Unterstützung {{variable}} */
+export function t(key, params = {}) {
+  let str = translations[key] ?? fallbackTranslations[key] ?? key;
+  for (const [k, v] of Object.entries(params)) {
+    str = str.replaceAll(`{{${k}}}`, String(v));
+  }
+  return str;
+}
+
+/** Aktuelle Locale abfragen */
+export function getLocale() {
+  return currentLocale;
+}
+
+/** Liste der unterstützten Locales */
+export function getSupportedLocales() {
+  return [...SUPPORTED_LOCALES];
+}
+
+/** Datum locale-aware formatieren */
+export function formatDate(date) {
+  if (date == null) return '';
+  const d = date instanceof Date ? date : new Date(date);
+  if (isNaN(d.getTime())) return '';
+  return new Intl.DateTimeFormat(currentLocale, {
+    day: '2-digit',
+    month: '2-digit',
+    year: 'numeric',
+  }).format(d);
+}
+
+/** Uhrzeit locale-aware formatieren */
+export function formatTime(date) {
+  if (date == null) return '';
+  const d = date instanceof Date ? date : new Date(date);
+  if (isNaN(d.getTime())) return '';
+  return new Intl.DateTimeFormat(currentLocale, {
+    hour: '2-digit',
+    minute: '2-digit',
+    hour12: false,
+  }).format(d);
+}
diff --git a/public/locales/.gitkeep b/public/locales/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/public/locales/de.json b/public/locales/de.json
new file mode 100644
index 0000000..c80f640
--- /dev/null
+++ b/public/locales/de.json
@@ -0,0 +1,540 @@
+{
+  "common": {
+    "save": "Speichern",
+    "cancel": "Abbrechen",
+    "delete": "Löschen",
+    "edit": "Bearbeiten",
+    "close": "Schließen",
+    "create": "Erstellen",
+    "add": "Hinzufügen",
+    "back": "Zurück",
+    "next": "Weiter",
+    "loading": "Lade…",
+    "saving": "Wird gespeichert…",
+    "required": "Dieses Feld ist erforderlich.",
+    "error": "Fehler",
+    "allFieldsRequired": "Bitte alle Felder ausfüllen.",
+    "today": "Heute",
+    "tomorrow": "Morgen",
+    "skipToContent": "Zum Inhalt springen",
+    "reload": "Neu laden",
+    "errorOccurred": "Etwas ist schiefgelaufen.",
+    "unexpectedError": "Ein unerwarteter Fehler ist aufgetreten.",
+    "errorGeneric": "Ein Fehler ist aufgetreten.",
+    "updateAvailable": "Update verfügbar — Seite neu laden für die neueste Version.",
+    "titleRequired": "Titel ist erforderlich",
+    "nameRequired": "Name ist erforderlich",
+    "contentRequired": "Inhalt ist erforderlich",
+    "all": "Alle",
+    "unknownError": "Unbekannter Fehler"
+  },
+
+  "nav": {
+    "dashboard": "Übersicht",
+    "tasks": "Aufgaben",
+    "calendar": "Kalender",
+    "meals": "Essen",
+    "shopping": "Einkauf",
+    "notes": "Pinnwand",
+    "contacts": "Kontakte",
+    "budget": "Budget",
+    "settings": "Einstellungen",
+    "main": "Hauptnavigation",
+    "navigation": "Navigation",
+    "quickActions": "Schnellaktionen"
+  },
+
+  "dashboard": {
+    "title": "Übersicht",
+    "greetingMorning": "Guten Morgen, {{name}}",
+    "greetingDay": "Guten Tag, {{name}}",
+    "greetingEvening": "Guten Abend, {{name}}",
+    "allDone": "Alles erledigt",
+    "noEvents": "Keine Termine",
+    "noPinnedNotes": "Keine angepinnten Notizen",
+    "todayMeals": "Heute essen",
+    "allLink": "Alle",
+    "weekLink": "Woche",
+    "urgentTasksChip": "{{count}} dring. Aufgabe",
+    "urgentTasksChipPlural": "{{count}} dring. Aufgaben",
+    "eventsChip": "{{count}} Termin heute",
+    "eventsChipPlural": "{{count}} Termine heute",
+    "todayMealChip": "Heute: {{title}}",
+    "loadError": "Dashboard konnte nicht vollständig geladen werden.",
+    "weatherRefresh": "Wetter aktualisieren",
+    "weatherRefreshTitle": "Aktualisieren",
+    "weatherFeelsLike": "Gefühlt {{temp}}° · {{humidity}}% · Wind {{wind}} km/h",
+    "fabTaskLabel": "Aufgabe hinzufügen",
+    "fabCalendarLabel": "Termin hinzufügen",
+    "fabShoppingLabel": "Einkauf hinzufügen",
+    "fabNoteLabel": "Notiz hinzufügen",
+    "fabTask": "Aufgabe",
+    "fabCalendar": "Termin",
+    "fabShopping": "Einkauf",
+    "fabNote": "Notiz",
+    "overdue": "Überfällig",
+    "dueSoon": "Heute fällig",
+    "dueTomorrow": "Morgen fällig",
+    "allDay": "Ganztägig"
+  },
+
+  "tasks": {
+    "title": "Aufgaben",
+    "newTask": "Neue Aufgabe",
+    "editTask": "Aufgabe bearbeiten",
+    "emptyTitle": "Keine Aufgaben — alles erledigt?",
+    "emptyDescription": "Neue Aufgaben über den + Button erstellen.",
+    "titleLabel": "Titel *",
+    "titlePlaceholder": "Was muss erledigt werden?",
+    "descriptionLabel": "Notiz",
+    "descriptionPlaceholder": "Optionale Details…",
+    "priorityLabel": "Priorität",
+    "categoryLabel": "Kategorie",
+    "dueDateLabel": "Fälligkeit",
+    "dueTimeLabel": "Uhrzeit",
+    "assignedLabel": "Zugewiesen an",
+    "assignedNobody": "— Niemand —",
+    "statusLabel": "Status",
+    "priorityUrgent": "Dringend",
+    "priorityHigh": "Hoch",
+    "priorityMedium": "Mittel",
+    "priorityLow": "Niedrig",
+    "statusOpen": "Offen",
+    "statusInProgress": "In Bearbeitung",
+    "statusDone": "Erledigt",
+    "categoryHousehold": "Haushalt",
+    "categorySchool": "Schule",
+    "categoryShopping": "Einkauf",
+    "categoryRepair": "Reparatur",
+    "categoryHealth": "Gesundheit",
+    "categoryFinance": "Finanzen",
+    "categoryLeisure": "Freizeit",
+    "categoryMisc": "Sonstiges",
+    "overdue": "Überfällig",
+    "overdueDay": "{{count}}d überfällig",
+    "dueToday": "Heute fällig",
+    "dueTomorrow": "Morgen fällig",
+    "groupOverdue": "Überfällig",
+    "groupToday": "Heute",
+    "groupThisWeek": "Diese Woche",
+    "groupNextWeek": "Nächste Woche",
+    "groupLater": "Später",
+    "groupNoDate": "Kein Datum",
+    "markDone": "{{title}} als erledigt markieren",
+    "editButton": "Aufgabe bearbeiten",
+    "swipeOpen": "Öffnen",
+    "swipeDone": "Erledigt",
+    "swipeEdit": "Bearbeiten",
+    "subtaskAdd": "+ Teilaufgabe hinzufügen",
+    "subtaskToggle": "Teilaufgaben anzeigen",
+    "subtaskMarkDone": "{{title}} als erledigt markieren",
+    "deleteConfirm": "Aufgabe und alle Teilaufgaben löschen?",
+    "savedToast": "Aufgabe gespeichert.",
+    "createdToast": "Aufgabe erstellt.",
+    "deletedToast": "Aufgabe gelöscht.",
+    "loadError": "Aufgabe konnte nicht geladen werden.",
+    "subtaskPrompt": "Teilaufgabe:",
+    "kanbanOpen": "Offen",
+    "kanbanInProgress": "In Bearbeitung",
+    "kanbanDone": "Erledigt",
+    "recurring": "Wiederkehrend",
+    "listView": "Listenansicht",
+    "kanbanView": "Kanban-Ansicht"
+  },
+
+  "shopping": {
+    "title": "Einkauf",
+    "noLists": "Keine Listen",
+    "noListsDescription": "Erstelle eine Liste mit dem + Button.",
+    "emptyList": "Die Liste ist leer",
+    "emptyListDescription": "Artikel über das Eingabefeld oben hinzufügen.",
+    "newListPrompt": "Name der neuen Liste:",
+    "newListButton": "Neue Liste erstellen",
+    "renameListPrompt": "Neuer Listen-Name:",
+    "deleteListConfirm": "Liste \"{{name}}\" und alle Artikel löschen?",
+    "deletedListToast": "Liste gelöscht.",
+    "itemsRemovedToast": "{{count}} Artikel entfernt.",
+    "clearChecked": "Abgehakt löschen ({{count}})",
+    "itemNamePlaceholder": "Artikel hinzufügen…",
+    "itemQtyPlaceholder": "Menge",
+    "itemNameLabel": "Artikelname",
+    "itemQtyLabel": "Menge",
+    "categoryLabel": "Kategorie",
+    "addItemLabel": "Artikel hinzufügen",
+    "renameListLabel": "Liste umbenennen",
+    "deleteListLabel": "Liste löschen",
+    "swipeBack": "Zurück",
+    "swipeCheck": "Abhaken",
+    "swipeDelete": "Löschen",
+    "markDoneLabel": "{{name}} abhaken",
+    "markUndoneLabel": "{{name}} als nicht erledigt markieren",
+    "deleteItemLabel": "{{name}} löschen",
+    "listsLoadError": "Listen konnten nicht geladen werden.",
+    "itemsLoadError": "Artikel konnten nicht geladen werden.",
+    "catFruitVeg": "Obst & Gemüse",
+    "catBakery": "Backwaren",
+    "catDairy": "Milchprodukte",
+    "catMeatFish": "Fleisch & Fisch",
+    "catFrozen": "Tiefkühl",
+    "catDrinks": "Getränke",
+    "catHousehold": "Haushalt",
+    "catDrugstore": "Drogerie",
+    "catMisc": "Sonstiges"
+  },
+
+  "meals": {
+    "title": "Essensplan",
+    "noMealPlanned": "Kein Essen geplant",
+    "addMeal": "{{type}} hinzufügen",
+    "editMeal": "Mahlzeit bearbeiten",
+    "addMealTitle": "Mahlzeit hinzufügen",
+    "deleteMeal": "Mahlzeit löschen",
+    "transferToShoppingList": "Zutaten auf Einkaufsliste",
+    "today": "Heute",
+    "prevWeek": "Vorherige Woche",
+    "nextWeek": "Nächste Woche",
+    "loadError": "Essensplan konnte nicht geladen werden.",
+    "typeBreakfast": "Frühstück",
+    "typeLunch": "Mittagessen",
+    "typeDinner": "Abendessen",
+    "typeSnack": "Snack",
+    "dayMo": "Mo",
+    "dayDi": "Di",
+    "dayMi": "Mi",
+    "dayDo": "Do",
+    "dayFr": "Fr",
+    "daySa": "Sa",
+    "daySo": "So",
+    "dateLabel": "Datum",
+    "mealTypeLabel": "Mahlzeit",
+    "titleLabel": "Titel *",
+    "titlePlaceholder": "z.B. Spaghetti Bolognese",
+    "notesLabel": "Notizen",
+    "notesPlaceholder": "Optional…",
+    "ingredientsLabel": "Zutaten",
+    "addIngredient": "Zutat hinzufügen",
+    "ingredientNamePlaceholder": "Zutat",
+    "ingredientQtyPlaceholder": "Menge",
+    "removeIngredient": "Zutat entfernen",
+    "transferLabel": "Zutaten auf Einkaufsliste übertragen",
+    "transferNow": "Jetzt übertragen",
+    "noShoppingLists": "Keine Einkaufslisten vorhanden",
+    "transferSuccess": "{{count}} Zutat übertragen",
+    "transferSuccessPlural": "{{count}} Zutaten übertragen",
+    "transferAlreadyDone": "Alle Zutaten bereits übertragen",
+    "ingredientCount": "{{count}} Zutat",
+    "ingredientCountPlural": "{{count}} Zutaten",
+    "titleRequired": "Titel ist erforderlich",
+    "loadingIndicator": "Lade…"
+  },
+
+  "calendar": {
+    "title": "Kalender",
+    "newEvent": "Neuer Termin",
+    "editEvent": "Termin bearbeiten",
+    "addEvent": "Termin hinzufügen",
+    "deleteEvent": "Termin löschen",
+    "noEvents": "Keine Termine im gewählten Zeitraum.",
+    "today": "Heute",
+    "back": "Zurück",
+    "forward": "Weiter",
+    "viewMonth": "Monat",
+    "viewWeek": "Woche",
+    "viewDay": "Tag",
+    "viewAgenda": "Agenda",
+    "allDay": "Ganztägig",
+    "allDayShort": "ganztg.",
+    "moreEvents": "+{{count}} weitere",
+    "weekNumberLabel": "KW {{week}} · {{month}} {{year}}",
+    "agendaFrom": "Ab {{date}}",
+    "titleLabel": "Titel *",
+    "titlePlaceholder": "z.B. Zahnarzt",
+    "allDayToggle": "Ganztägig",
+    "startDateLabel": "Startdatum",
+    "startTimeLabel": "Startzeit",
+    "endDateLabel": "Enddatum",
+    "endTimeLabel": "Endzeit",
+    "fromLabel": "Von",
+    "toLabel": "Bis",
+    "locationLabel": "Ort",
+    "locationPlaceholder": "Optional",
+    "assignedLabel": "Zugewiesen an",
+    "assignedNobody": "— Niemand —",
+    "colorLabel": "Farbe",
+    "descriptionLabel": "Beschreibung",
+    "descriptionPlaceholder": "Optional…",
+    "popupEdit": "Bearbeiten",
+    "deleteConfirm": "\"{{title}}\" wirklich löschen?",
+    "createdToast": "Termin erstellt",
+    "savedToast": "Termin gespeichert",
+    "deletedToast": "Termin gelöscht",
+    "loadError": "Termine konnten nicht geladen werden.",
+    "saveError": "Fehler beim Speichern",
+    "deleteError": "Fehler beim Löschen",
+    "titleRequired": "Titel ist erforderlich",
+    "monthJanuary": "Januar",
+    "monthFebruary": "Februar",
+    "monthMarch": "März",
+    "monthApril": "April",
+    "monthMay": "Mai",
+    "monthJune": "Juni",
+    "monthJuly": "Juli",
+    "monthAugust": "August",
+    "monthSeptember": "September",
+    "monthOctober": "Oktober",
+    "monthNovember": "November",
+    "monthDecember": "Dezember",
+    "dayShortSunday": "So",
+    "dayShortMonday": "Mo",
+    "dayShortTuesday": "Di",
+    "dayShortWednesday": "Mi",
+    "dayShortThursday": "Do",
+    "dayShortFriday": "Fr",
+    "dayShortSaturday": "Sa",
+    "dayLongSunday": "Sonntag",
+    "dayLongMonday": "Montag",
+    "dayLongTuesday": "Dienstag",
+    "dayLongWednesday": "Mittwoch",
+    "dayLongThursday": "Donnerstag",
+    "dayLongFriday": "Freitag",
+    "dayLongSaturday": "Samstag",
+    "timeSuffix": "Uhr",
+    "colorLabel": "Farbe {{color}}"
+  },
+
+  "notes": {
+    "title": "Pinnwand",
+    "newNote": "Neue Notiz",
+    "editNote": "Notiz bearbeiten",
+    "addNoteLabel": "Neue Notiz",
+    "searchPlaceholder": "Notizen durchsuchen…",
+    "emptyTitle": "Noch keine Notizen",
+    "emptyDescription": "Neue Notiz über den + Button erstellen.",
+    "noResultsTitle": "Keine Treffer",
+    "noResultsDescription": "Keine Notiz enthält \"{{query}}\".",
+    "titleLabel": "Titel (optional)",
+    "titlePlaceholder": "Kein Titel",
+    "contentLabel": "Inhalt",
+    "contentMarkdownHint": "(Markdown-Formatierung möglich)",
+    "contentPlaceholder": "Notiz eingeben…",
+    "colorLabel": "Farbe",
+    "pinnedLabel": "Anpinnen (erscheint auf Dashboard)",
+    "pinAction": "Anpinnen",
+    "unpinAction": "Anpinnen aufheben",
+    "deleteLabel": "Notiz löschen",
+    "deleteConfirm": "Notiz wirklich löschen?",
+    "createdToast": "Notiz erstellt",
+    "savedToast": "Notiz gespeichert",
+    "deletedToast": "Notiz gelöscht",
+    "loadError": "Notizen konnten nicht geladen werden.",
+    "formatBold": "Fett (Strg+B)",
+    "formatItalic": "Kursiv (Strg+I)",
+    "formatUnderline": "Unterstrichen (Strg+U)",
+    "formatStrikethrough": "Durchgestrichen",
+    "formatHeading": "Überschrift",
+    "formatList": "Aufzählung",
+    "formatOrderedList": "Nummerierte Liste",
+    "formatChecklist": "Checkliste",
+    "formatLink": "Link",
+    "formatCode": "Code",
+    "formatQuote": "Zitat",
+    "formatDivider": "Trennlinie"
+  },
+
+  "contacts": {
+    "title": "Kontakte",
+    "newContact": "Neuer Kontakt",
+    "editContact": "Kontakt bearbeiten",
+    "addButton": "Neu",
+    "newContactLabel": "Neuer Kontakt",
+    "searchPlaceholder": "Name, Telefon oder E-Mail suchen…",
+    "importButton": "Import",
+    "importLabel": "Kontakt aus vCard importieren",
+    "importTooltip": "vCard importieren",
+    "emptyTitle": "Noch keine Kontakte",
+    "emptyDescription": "Neue Kontakte über den + Button hinzufügen.",
+    "filterAll": "Alle",
+    "nameLabel": "Name *",
+    "namePlaceholder": "Vollständiger Name",
+    "categoryLabel": "Kategorie",
+    "phoneLabel": "Telefon",
+    "phonePlaceholder": "+49 …",
+    "emailLabel": "E-Mail",
+    "emailPlaceholder": "name@beispiel.de",
+    "addressLabel": "Adresse",
+    "addressPlaceholder": "Straße, PLZ Ort",
+    "notesLabel": "Notizen",
+    "notesPlaceholder": "Optional…",
+    "callLabel": "Anrufen",
+    "emailActionLabel": "E-Mail",
+    "mapsLabel": "In Maps öffnen",
+    "exportLabel": "Als vCard exportieren",
+    "exportTooltip": "vCard exportieren",
+    "deleteLabel": "Kontakt löschen",
+    "deleteConfirm": "Kontakt wirklich löschen?",
+    "deletePersonConfirm": "\"{{name}}\" wirklich löschen?",
+    "savedToast": "Kontakt gespeichert",
+    "updatedToast": "Kontakt aktualisiert",
+    "deletedToast": "Kontakt gelöscht",
+    "importedToast": "{{name}} importiert.",
+    "importError": "Import fehlgeschlagen: {{error}}",
+    "vcardNoName": "vCard enthält keinen Namen.",
+    "catDoctor": "Arzt",
+    "catSchool": "Schule/Kita",
+    "catAuthority": "Behörde",
+    "catInsurance": "Versicherung",
+    "catCraftsman": "Handwerker",
+    "catEmergency": "Notfall",
+    "catMisc": "Sonstiges",
+    "categoryDoctor": "Arzt",
+    "categorySchool": "Schule/Kita",
+    "categoryAuthority": "Behörde",
+    "categoryInsurance": "Versicherung",
+    "categoryCraftsman": "Handwerker",
+    "categoryEmergency": "Notfall",
+    "categoryOther": "Sonstiges"
+  },
+
+  "budget": {
+    "title": "Budget",
+    "newEntry": "Neuer Eintrag",
+    "editEntry": "Eintrag bearbeiten",
+    "addEntryLabel": "Eintrag hinzufügen",
+    "newEntryFabLabel": "Neuer Eintrag",
+    "currentMonth": "Aktuell",
+    "prevMonth": "Vorheriger Monat",
+    "nextMonth": "Nächster Monat",
+    "income": "Einnahmen",
+    "expenses": "Ausgaben",
+    "balance": "Saldo",
+    "byCategory": "Nach Kategorie",
+    "transactions": "Transaktionen",
+    "emptyTitle": "Keine Einträge diesen Monat",
+    "emptyDescription": "Budget-Einträge über den + Button hinzufügen.",
+    "csvExport": "CSV",
+    "typeExpense": "Ausgabe",
+    "typeIncome": "Einnahme",
+    "titleLabel": "Titel *",
+    "titlePlaceholder": "z.B. REWE Einkauf",
+    "amountLabel": "Betrag (€) *",
+    "amountPlaceholder": "0,00",
+    "categoryLabel": "Kategorie",
+    "dateLabel": "Datum *",
+    "recurringLabel": "Wiederkehrend",
+    "deleteLabel": "Eintrag löschen",
+    "deleteConfirm": "Eintrag wirklich löschen?",
+    "deletePersonConfirm": "\"{{title}}\" wirklich löschen?",
+    "addedToast": "Eintrag hinzugefügt",
+    "savedToast": "Eintrag gespeichert",
+    "deletedToast": "Eintrag gelöscht",
+    "loadError": "Budget konnte nicht geladen werden.",
+    "trendNeutral": "— wie {{month}}",
+    "validAmountRequired": "Gültigen Betrag eingeben",
+    "dateRequired": "Datum ist erforderlich",
+    "catFood": "Lebensmittel",
+    "catRent": "Miete",
+    "catInsurance": "Versicherung",
+    "catMobility": "Mobilität",
+    "catLeisure": "Freizeit",
+    "catClothing": "Kleidung",
+    "catHealth": "Gesundheit",
+    "catEducation": "Bildung",
+    "catMisc": "Sonstiges",
+    "loadingIndicator": "Lade…"
+  },
+
+  "settings": {
+    "title": "Einstellungen",
+    "sectionDesign": "Design",
+    "sectionAccount": "Mein Konto",
+    "sectionCalendarSync": "Kalender-Synchronisation",
+    "sectionFamily": "Familienmitglieder",
+    "cardAppearance": "Darstellung",
+    "themeSystem": "System",
+    "themeSysLabel": "System-Einstellung verwenden",
+    "themeLight": "Hell",
+    "themeLightLabel": "Helles Design",
+    "themeDark": "Dunkel",
+    "themeDarkLabel": "Dunkles Design",
+    "changePassword": "Passwort ändern",
+    "currentPasswordLabel": "Aktuelles Passwort",
+    "newPasswordLabel": "Neues Passwort",
+    "confirmPasswordLabel": "Neues Passwort bestätigen",
+    "savePassword": "Passwort speichern",
+    "passwordMismatch": "Passwörter stimmen nicht überein.",
+    "passwordSavedToast": "Passwort erfolgreich geändert.",
+    "googleCalendar": "Google Calendar",
+    "appleCalendar": "Apple Calendar (iCloud)",
+    "syncNow": "Jetzt synchronisieren",
+    "disconnect": "Verbindung trennen",
+    "connectGoogle": "Mit Google verbinden",
+    "connected": "Verbunden",
+    "connectedLastSync": "Verbunden · Zuletzt: {{date}}",
+    "notConnected": "Nicht verbunden",
+    "notConfigured": "Nicht konfiguriert (fehlende .env-Variablen)",
+    "configured": "Konfiguriert (via .env)",
+    "configuredLastSync": "Konfiguriert (via .env) · Zuletzt: {{date}}",
+    "syncSuccess": "{{provider}} synchronisiert.",
+    "disconnectedToast": "{{provider}} getrennt.",
+    "googleOnlyAdmin": "Nur Admin kann Google Calendar verbinden.",
+    "appleOnlyAdmin": "Nur Admin kann Apple Calendar verbinden.",
+    "caldavUrlLabel": "CalDAV-Server-URL",
+    "caldavUrlPlaceholder": "https://caldav.icloud.com",
+    "appleIdLabel": "Apple-ID (E-Mail)",
+    "applePasswordLabel": "App-spezifisches Passwort",
+    "applePasswordHint": "Passwort unter <strong>appleid.apple.com → Sicherheit</strong> erstellen.",
+    "appleConnectBtn": "Verbinden & testen",
+    "appleConnecting": "Verbinde…",
+    "appleConnectedToast": "Apple Calendar verbunden.",
+    "syncSuccessGoogle": "Kalender-Sync mit Google erfolgreich verbunden.",
+    "syncSuccessApple": "Kalender-Sync mit Apple erfolgreich verbunden.",
+    "syncErrorGoogle": "Verbindung mit Google fehlgeschlagen. Bitte erneut versuchen.",
+    "syncErrorApple": "Verbindung mit Apple fehlgeschlagen. Bitte erneut versuchen.",
+    "addMember": "+ Mitglied hinzufügen",
+    "newMemberTitle": "Neues Familienmitglied",
+    "usernameLabel": "Benutzername",
+    "displayNameLabel": "Anzeigename",
+    "memberPasswordLabel": "Passwort",
+    "colorLabel": "Farbe",
+    "roleLabel": "Rolle",
+    "roleMember": "Mitglied",
+    "roleAdmin": "Admin",
+    "createMember": "Erstellen",
+    "cancelAddMember": "Abbrechen",
+    "memberAddedToast": "{{name}} hinzugefügt.",
+    "deleteMemberConfirm": "{{name}} wirklich löschen?",
+    "memberDeletedToast": "{{name}} gelöscht.",
+    "deleteMemberLabel": "Löschen",
+    "logout": "Abmelden",
+    "synchronizing": "Synchronisiere…",
+    "googleDisconnectConfirm": "Google Calendar-Verbindung trennen?",
+    "appleDisconnectConfirm": "Apple Calendar-Verbindung trennen?",
+    "localeSystem": "System",
+    "languageTitle": "Sprache"
+  },
+
+  "login": {
+    "tagline": "Familienplanung. Sicher. Datenschutzfreundlich. Open Source.",
+    "usernameLabel": "Benutzername",
+    "usernamePlaceholder": "benutzername",
+    "passwordLabel": "Passwort",
+    "passwordPlaceholder": "••••••••",
+    "loginButton": "Anmelden",
+    "loggingIn": "Wird angemeldet …",
+    "tooManyAttempts": "Zu viele Versuche. Bitte warte kurz.",
+    "invalidCredentials": "Ungültige Anmeldedaten."
+  },
+
+  "install": {
+    "title": "Oikos installieren",
+    "subtitle": "Zur App hinzufügen",
+    "iosTip1": "Tippe auf ",
+    "iosTip2": " \u2192 \"Zum Home-Bildschirm\"",
+    "installButton": "Installieren",
+    "dismissLabel": "Schließen"
+  },
+
+  "modal": {
+    "closeLabel": "Schließen"
+  }
+}
diff --git a/public/locales/en.json b/public/locales/en.json
new file mode 100644
index 0000000..d2f94a0
--- /dev/null
+++ b/public/locales/en.json
@@ -0,0 +1,540 @@
+{
+  "common": {
+    "save": "Save",
+    "cancel": "Cancel",
+    "delete": "Delete",
+    "edit": "Edit",
+    "close": "Close",
+    "create": "Create",
+    "add": "Add",
+    "back": "Back",
+    "next": "Next",
+    "loading": "Loading…",
+    "saving": "Saving…",
+    "required": "This field is required.",
+    "error": "Error",
+    "allFieldsRequired": "Please fill in all fields.",
+    "today": "Today",
+    "tomorrow": "Tomorrow",
+    "skipToContent": "Skip to content",
+    "reload": "Reload",
+    "errorOccurred": "Something went wrong.",
+    "unexpectedError": "An unexpected error occurred.",
+    "errorGeneric": "An error occurred.",
+    "updateAvailable": "Update available — reload the page to get the latest version.",
+    "titleRequired": "Title is required",
+    "nameRequired": "Name is required",
+    "contentRequired": "Content is required",
+    "all": "All",
+    "unknownError": "Unknown error"
+  },
+
+  "nav": {
+    "dashboard": "Overview",
+    "tasks": "Tasks",
+    "calendar": "Calendar",
+    "meals": "Meals",
+    "shopping": "Shopping",
+    "notes": "Board",
+    "contacts": "Contacts",
+    "budget": "Budget",
+    "settings": "Settings",
+    "main": "Main navigation",
+    "navigation": "Navigation",
+    "quickActions": "Quick actions"
+  },
+
+  "dashboard": {
+    "title": "Overview",
+    "greetingMorning": "Good morning, {{name}}",
+    "greetingDay": "Good afternoon, {{name}}",
+    "greetingEvening": "Good evening, {{name}}",
+    "allDone": "All done",
+    "noEvents": "No events",
+    "noPinnedNotes": "No pinned notes",
+    "todayMeals": "Today's meals",
+    "allLink": "All",
+    "weekLink": "Week",
+    "urgentTasksChip": "{{count}} urgent task",
+    "urgentTasksChipPlural": "{{count}} urgent tasks",
+    "eventsChip": "{{count}} event today",
+    "eventsChipPlural": "{{count}} events today",
+    "todayMealChip": "Today: {{title}}",
+    "loadError": "Dashboard could not be fully loaded.",
+    "weatherRefresh": "Refresh weather",
+    "weatherRefreshTitle": "Refresh",
+    "weatherFeelsLike": "Feels like {{temp}}° · {{humidity}}% · Wind {{wind}} km/h",
+    "fabTaskLabel": "Add task",
+    "fabCalendarLabel": "Add event",
+    "fabShoppingLabel": "Add shopping",
+    "fabNoteLabel": "Add note",
+    "fabTask": "Task",
+    "fabCalendar": "Event",
+    "fabShopping": "Shopping",
+    "fabNote": "Note",
+    "overdue": "Overdue",
+    "dueSoon": "Due today",
+    "dueTomorrow": "Due tomorrow",
+    "allDay": "All day"
+  },
+
+  "tasks": {
+    "title": "Tasks",
+    "newTask": "New Task",
+    "editTask": "Edit Task",
+    "emptyTitle": "No tasks — all done?",
+    "emptyDescription": "Create new tasks with the + button.",
+    "titleLabel": "Title *",
+    "titlePlaceholder": "What needs to be done?",
+    "descriptionLabel": "Note",
+    "descriptionPlaceholder": "Optional details…",
+    "priorityLabel": "Priority",
+    "categoryLabel": "Category",
+    "dueDateLabel": "Due date",
+    "dueTimeLabel": "Time",
+    "assignedLabel": "Assigned to",
+    "assignedNobody": "— Nobody —",
+    "statusLabel": "Status",
+    "priorityUrgent": "Urgent",
+    "priorityHigh": "High",
+    "priorityMedium": "Medium",
+    "priorityLow": "Low",
+    "statusOpen": "Open",
+    "statusInProgress": "In Progress",
+    "statusDone": "Done",
+    "categoryHousehold": "Household",
+    "categorySchool": "School",
+    "categoryShopping": "Shopping",
+    "categoryRepair": "Repair",
+    "categoryHealth": "Health",
+    "categoryFinance": "Finance",
+    "categoryLeisure": "Leisure",
+    "categoryMisc": "Miscellaneous",
+    "overdue": "Overdue",
+    "overdueDay": "{{count}}d overdue",
+    "dueToday": "Due today",
+    "dueTomorrow": "Due tomorrow",
+    "groupOverdue": "Overdue",
+    "groupToday": "Today",
+    "groupThisWeek": "This week",
+    "groupNextWeek": "Next week",
+    "groupLater": "Later",
+    "groupNoDate": "No date",
+    "markDone": "Mark {{title}} as done",
+    "editButton": "Edit task",
+    "swipeOpen": "Reopen",
+    "swipeDone": "Done",
+    "swipeEdit": "Edit",
+    "subtaskAdd": "+ Add subtask",
+    "subtaskToggle": "Show subtasks",
+    "subtaskMarkDone": "Mark {{title}} as done",
+    "deleteConfirm": "Delete task and all subtasks?",
+    "savedToast": "Task saved.",
+    "createdToast": "Task created.",
+    "deletedToast": "Task deleted.",
+    "loadError": "Task could not be loaded.",
+    "subtaskPrompt": "Subtask:",
+    "kanbanOpen": "Open",
+    "kanbanInProgress": "In Progress",
+    "kanbanDone": "Done",
+    "recurring": "Recurring",
+    "listView": "List view",
+    "kanbanView": "Kanban view"
+  },
+
+  "shopping": {
+    "title": "Shopping",
+    "noLists": "No lists",
+    "noListsDescription": "Create a list with the + button.",
+    "emptyList": "The list is empty",
+    "emptyListDescription": "Add items using the input field above.",
+    "newListPrompt": "Name for the new list:",
+    "newListButton": "Create new list",
+    "renameListPrompt": "New list name:",
+    "deleteListConfirm": "Delete list \"{{name}}\" and all items?",
+    "deletedListToast": "List deleted.",
+    "itemsRemovedToast": "{{count}} items removed.",
+    "clearChecked": "Remove checked ({{count}})",
+    "itemNamePlaceholder": "Add item…",
+    "itemQtyPlaceholder": "Quantity",
+    "itemNameLabel": "Item name",
+    "itemQtyLabel": "Quantity",
+    "categoryLabel": "Category",
+    "addItemLabel": "Add item",
+    "renameListLabel": "Rename list",
+    "deleteListLabel": "Delete list",
+    "swipeBack": "Undo",
+    "swipeCheck": "Check off",
+    "swipeDelete": "Delete",
+    "markDoneLabel": "Check off {{name}}",
+    "markUndoneLabel": "Uncheck {{name}}",
+    "deleteItemLabel": "Delete {{name}}",
+    "listsLoadError": "Lists could not be loaded.",
+    "itemsLoadError": "Items could not be loaded.",
+    "catFruitVeg": "Fruit & Vegetables",
+    "catBakery": "Bakery",
+    "catDairy": "Dairy",
+    "catMeatFish": "Meat & Fish",
+    "catFrozen": "Frozen",
+    "catDrinks": "Drinks",
+    "catHousehold": "Household",
+    "catDrugstore": "Drugstore",
+    "catMisc": "Miscellaneous"
+  },
+
+  "meals": {
+    "title": "Meal Plan",
+    "noMealPlanned": "No meal planned",
+    "addMeal": "Add {{type}}",
+    "editMeal": "Edit meal",
+    "addMealTitle": "Add meal",
+    "deleteMeal": "Delete meal",
+    "transferToShoppingList": "Add ingredients to shopping list",
+    "today": "Today",
+    "prevWeek": "Previous week",
+    "nextWeek": "Next week",
+    "loadError": "Meal plan could not be loaded.",
+    "typeBreakfast": "Breakfast",
+    "typeLunch": "Lunch",
+    "typeDinner": "Dinner",
+    "typeSnack": "Snack",
+    "dayMo": "Mon",
+    "dayDi": "Tue",
+    "dayMi": "Wed",
+    "dayDo": "Thu",
+    "dayFr": "Fri",
+    "daySa": "Sat",
+    "daySo": "Sun",
+    "dateLabel": "Date",
+    "mealTypeLabel": "Meal",
+    "titleLabel": "Title *",
+    "titlePlaceholder": "e.g. Spaghetti Bolognese",
+    "notesLabel": "Notes",
+    "notesPlaceholder": "Optional…",
+    "ingredientsLabel": "Ingredients",
+    "addIngredient": "Add ingredient",
+    "ingredientNamePlaceholder": "Ingredient",
+    "ingredientQtyPlaceholder": "Quantity",
+    "removeIngredient": "Remove ingredient",
+    "transferLabel": "Transfer ingredients to shopping list",
+    "transferNow": "Transfer now",
+    "noShoppingLists": "No shopping lists available",
+    "transferSuccess": "{{count}} ingredient transferred",
+    "transferSuccessPlural": "{{count}} ingredients transferred",
+    "transferAlreadyDone": "All ingredients already transferred",
+    "ingredientCount": "{{count}} ingredient",
+    "ingredientCountPlural": "{{count}} ingredients",
+    "titleRequired": "Title is required",
+    "loadingIndicator": "Loading…"
+  },
+
+  "calendar": {
+    "title": "Calendar",
+    "newEvent": "New Event",
+    "editEvent": "Edit Event",
+    "addEvent": "Add event",
+    "deleteEvent": "Delete event",
+    "noEvents": "No events in the selected period.",
+    "today": "Today",
+    "back": "Back",
+    "forward": "Forward",
+    "viewMonth": "Month",
+    "viewWeek": "Week",
+    "viewDay": "Day",
+    "viewAgenda": "Agenda",
+    "allDay": "All day",
+    "allDayShort": "all day",
+    "moreEvents": "+{{count}} more",
+    "weekNumberLabel": "W{{week}} · {{month}} {{year}}",
+    "agendaFrom": "From {{date}}",
+    "titleLabel": "Title *",
+    "titlePlaceholder": "e.g. Dentist",
+    "allDayToggle": "All day",
+    "startDateLabel": "Start date",
+    "startTimeLabel": "Start time",
+    "endDateLabel": "End date",
+    "endTimeLabel": "End time",
+    "fromLabel": "From",
+    "toLabel": "To",
+    "locationLabel": "Location",
+    "locationPlaceholder": "Optional",
+    "assignedLabel": "Assigned to",
+    "assignedNobody": "— Nobody —",
+    "colorLabel": "Color",
+    "descriptionLabel": "Description",
+    "descriptionPlaceholder": "Optional…",
+    "popupEdit": "Edit",
+    "deleteConfirm": "Really delete \"{{title}}\"?",
+    "createdToast": "Event created",
+    "savedToast": "Event saved",
+    "deletedToast": "Event deleted",
+    "loadError": "Events could not be loaded.",
+    "saveError": "Error saving",
+    "deleteError": "Error deleting",
+    "titleRequired": "Title is required",
+    "monthJanuary": "January",
+    "monthFebruary": "February",
+    "monthMarch": "March",
+    "monthApril": "April",
+    "monthMay": "May",
+    "monthJune": "June",
+    "monthJuly": "July",
+    "monthAugust": "August",
+    "monthSeptember": "September",
+    "monthOctober": "October",
+    "monthNovember": "November",
+    "monthDecember": "December",
+    "dayShortSunday": "Sun",
+    "dayShortMonday": "Mon",
+    "dayShortTuesday": "Tue",
+    "dayShortWednesday": "Wed",
+    "dayShortThursday": "Thu",
+    "dayShortFriday": "Fri",
+    "dayShortSaturday": "Sat",
+    "dayLongSunday": "Sunday",
+    "dayLongMonday": "Monday",
+    "dayLongTuesday": "Tuesday",
+    "dayLongWednesday": "Wednesday",
+    "dayLongThursday": "Thursday",
+    "dayLongFriday": "Friday",
+    "dayLongSaturday": "Saturday",
+    "timeSuffix": "",
+    "colorLabel": "Color {{color}}"
+  },
+
+  "notes": {
+    "title": "Board",
+    "newNote": "New Note",
+    "editNote": "Edit Note",
+    "addNoteLabel": "New Note",
+    "searchPlaceholder": "Search notes…",
+    "emptyTitle": "No notes yet",
+    "emptyDescription": "Create a new note with the + button.",
+    "noResultsTitle": "No results",
+    "noResultsDescription": "No note contains \"{{query}}\".",
+    "titleLabel": "Title (optional)",
+    "titlePlaceholder": "No title",
+    "contentLabel": "Content",
+    "contentMarkdownHint": "(Markdown formatting supported)",
+    "contentPlaceholder": "Enter note…",
+    "colorLabel": "Color",
+    "pinnedLabel": "Pin (appears on dashboard)",
+    "pinAction": "Pin",
+    "unpinAction": "Unpin",
+    "deleteLabel": "Delete note",
+    "deleteConfirm": "Really delete this note?",
+    "createdToast": "Note created",
+    "savedToast": "Note saved",
+    "deletedToast": "Note deleted",
+    "loadError": "Notes could not be loaded.",
+    "formatBold": "Bold (Ctrl+B)",
+    "formatItalic": "Italic (Ctrl+I)",
+    "formatUnderline": "Underline (Ctrl+U)",
+    "formatStrikethrough": "Strikethrough",
+    "formatHeading": "Heading",
+    "formatList": "Bullet list",
+    "formatOrderedList": "Numbered list",
+    "formatChecklist": "Checklist",
+    "formatLink": "Link",
+    "formatCode": "Code",
+    "formatQuote": "Quote",
+    "formatDivider": "Divider"
+  },
+
+  "contacts": {
+    "title": "Contacts",
+    "newContact": "New Contact",
+    "editContact": "Edit Contact",
+    "addButton": "New",
+    "newContactLabel": "New Contact",
+    "searchPlaceholder": "Search by name, phone or email…",
+    "importButton": "Import",
+    "importLabel": "Import contact from vCard",
+    "importTooltip": "Import vCard",
+    "emptyTitle": "No contacts yet",
+    "emptyDescription": "Add new contacts with the + button.",
+    "filterAll": "All",
+    "nameLabel": "Name *",
+    "namePlaceholder": "Full name",
+    "categoryLabel": "Category",
+    "phoneLabel": "Phone",
+    "phonePlaceholder": "+1 …",
+    "emailLabel": "Email",
+    "emailPlaceholder": "name@example.com",
+    "addressLabel": "Address",
+    "addressPlaceholder": "Street, ZIP City",
+    "notesLabel": "Notes",
+    "notesPlaceholder": "Optional…",
+    "callLabel": "Call",
+    "emailActionLabel": "Email",
+    "mapsLabel": "Open in Maps",
+    "exportLabel": "Export as vCard",
+    "exportTooltip": "Export vCard",
+    "deleteLabel": "Delete contact",
+    "deleteConfirm": "Really delete this contact?",
+    "deletePersonConfirm": "Really delete \"{{name}}\"?",
+    "savedToast": "Contact saved",
+    "updatedToast": "Contact updated",
+    "deletedToast": "Contact deleted",
+    "importedToast": "{{name}} imported.",
+    "importError": "Import failed: {{error}}",
+    "vcardNoName": "vCard does not contain a name.",
+    "catDoctor": "Doctor",
+    "catSchool": "School/Childcare",
+    "catAuthority": "Authority",
+    "catInsurance": "Insurance",
+    "catCraftsman": "Tradesperson",
+    "catEmergency": "Emergency",
+    "catMisc": "Miscellaneous",
+    "categoryDoctor": "Doctor",
+    "categorySchool": "School/Daycare",
+    "categoryAuthority": "Authority",
+    "categoryInsurance": "Insurance",
+    "categoryCraftsman": "Tradesperson",
+    "categoryEmergency": "Emergency",
+    "categoryOther": "Other"
+  },
+
+  "budget": {
+    "title": "Budget",
+    "newEntry": "New Entry",
+    "editEntry": "Edit Entry",
+    "addEntryLabel": "Add entry",
+    "newEntryFabLabel": "New Entry",
+    "currentMonth": "Current",
+    "prevMonth": "Previous month",
+    "nextMonth": "Next month",
+    "income": "Income",
+    "expenses": "Expenses",
+    "balance": "Balance",
+    "byCategory": "By category",
+    "transactions": "Transactions",
+    "emptyTitle": "No entries this month",
+    "emptyDescription": "Add budget entries with the + button.",
+    "csvExport": "CSV",
+    "typeExpense": "Expense",
+    "typeIncome": "Income",
+    "titleLabel": "Title *",
+    "titlePlaceholder": "e.g. Supermarket",
+    "amountLabel": "Amount (€) *",
+    "amountPlaceholder": "0.00",
+    "categoryLabel": "Category",
+    "dateLabel": "Date *",
+    "recurringLabel": "Recurring",
+    "deleteLabel": "Delete entry",
+    "deleteConfirm": "Really delete this entry?",
+    "deletePersonConfirm": "Really delete \"{{title}}\"?",
+    "addedToast": "Entry added",
+    "savedToast": "Entry saved",
+    "deletedToast": "Entry deleted",
+    "loadError": "Budget could not be loaded.",
+    "trendNeutral": "— same as {{month}}",
+    "validAmountRequired": "Please enter a valid amount",
+    "dateRequired": "Date is required",
+    "catFood": "Groceries",
+    "catRent": "Rent",
+    "catInsurance": "Insurance",
+    "catMobility": "Transport",
+    "catLeisure": "Leisure",
+    "catClothing": "Clothing",
+    "catHealth": "Health",
+    "catEducation": "Education",
+    "catMisc": "Miscellaneous",
+    "loadingIndicator": "Loading…"
+  },
+
+  "settings": {
+    "title": "Settings",
+    "sectionDesign": "Appearance",
+    "sectionAccount": "My Account",
+    "sectionCalendarSync": "Calendar Sync",
+    "sectionFamily": "Family Members",
+    "cardAppearance": "Display",
+    "themeSystem": "System",
+    "themeSysLabel": "Use system setting",
+    "themeLight": "Light",
+    "themeLightLabel": "Light mode",
+    "themeDark": "Dark",
+    "themeDarkLabel": "Dark mode",
+    "changePassword": "Change password",
+    "currentPasswordLabel": "Current password",
+    "newPasswordLabel": "New password",
+    "confirmPasswordLabel": "Confirm new password",
+    "savePassword": "Save password",
+    "passwordMismatch": "Passwords do not match.",
+    "passwordSavedToast": "Password changed successfully.",
+    "googleCalendar": "Google Calendar",
+    "appleCalendar": "Apple Calendar (iCloud)",
+    "syncNow": "Sync now",
+    "disconnect": "Disconnect",
+    "connectGoogle": "Connect with Google",
+    "connected": "Connected",
+    "connectedLastSync": "Connected · Last: {{date}}",
+    "notConnected": "Not connected",
+    "notConfigured": "Not configured (missing .env variables)",
+    "configured": "Configured (via .env)",
+    "configuredLastSync": "Configured (via .env) · Last: {{date}}",
+    "syncSuccess": "{{provider}} synced.",
+    "disconnectedToast": "{{provider}} disconnected.",
+    "googleOnlyAdmin": "Only admin can connect Google Calendar.",
+    "appleOnlyAdmin": "Only admin can connect Apple Calendar.",
+    "caldavUrlLabel": "CalDAV Server URL",
+    "caldavUrlPlaceholder": "https://caldav.icloud.com",
+    "appleIdLabel": "Apple ID (email)",
+    "applePasswordLabel": "App-specific password",
+    "applePasswordHint": "Create password at <strong>appleid.apple.com → Security</strong>.",
+    "appleConnectBtn": "Connect & test",
+    "appleConnecting": "Connecting…",
+    "appleConnectedToast": "Apple Calendar connected.",
+    "syncSuccessGoogle": "Calendar sync with Google connected successfully.",
+    "syncSuccessApple": "Calendar sync with Apple connected successfully.",
+    "syncErrorGoogle": "Connection to Google failed. Please try again.",
+    "syncErrorApple": "Connection to Apple failed. Please try again.",
+    "addMember": "+ Add member",
+    "newMemberTitle": "New Family Member",
+    "usernameLabel": "Username",
+    "displayNameLabel": "Display name",
+    "memberPasswordLabel": "Password",
+    "colorLabel": "Color",
+    "roleLabel": "Role",
+    "roleMember": "Member",
+    "roleAdmin": "Admin",
+    "createMember": "Create",
+    "cancelAddMember": "Cancel",
+    "memberAddedToast": "{{name}} added.",
+    "deleteMemberConfirm": "Really delete {{name}}?",
+    "memberDeletedToast": "{{name}} deleted.",
+    "deleteMemberLabel": "Delete",
+    "logout": "Log out",
+    "synchronizing": "Syncing…",
+    "googleDisconnectConfirm": "Disconnect Google Calendar?",
+    "appleDisconnectConfirm": "Disconnect Apple Calendar?",
+    "localeSystem": "System",
+    "languageTitle": "Language"
+  },
+
+  "login": {
+    "tagline": "Family planning. Secure. Privacy-friendly. Open source.",
+    "usernameLabel": "Username",
+    "usernamePlaceholder": "username",
+    "passwordLabel": "Password",
+    "passwordPlaceholder": "••••••••",
+    "loginButton": "Log in",
+    "loggingIn": "Logging in…",
+    "tooManyAttempts": "Too many attempts. Please wait a moment.",
+    "invalidCredentials": "Invalid credentials."
+  },
+
+  "install": {
+    "title": "Install Oikos",
+    "subtitle": "Add to home screen",
+    "iosTip1": "Tap ",
+    "iosTip2": " → \"Add to Home Screen\"",
+    "installButton": "Install",
+    "dismissLabel": "Close"
+  },
+
+  "modal": {
+    "closeLabel": "Close"
+  }
+}
diff --git a/public/pages/budget.js b/public/pages/budget.js
index 301a209..9ee9a26 100644
--- a/public/pages/budget.js
+++ b/public/pages/budget.js
@@ -8,6 +8,7 @@
 import { api } from '/api.js';
 import { openModal as openSharedModal, closeModal } from '/components/modal.js';
 import { stagger, vibrate } from '/utils/ux.js';
+import { t, formatDate, getLocale } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
@@ -18,8 +19,23 @@ const CATEGORIES = [
   'Freizeit', 'Kleidung', 'Gesundheit', 'Bildung', 'Sonstiges',
 ];
 
-const MONTH_NAMES = ['Januar', 'Februar', 'März', 'April', 'Mai', 'Juni',
-                     'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'];
+const CATEGORY_LABELS = () => ({
+  'Lebensmittel': t('budget.catFood'),
+  'Miete':        t('budget.catRent'),
+  'Versicherung': t('budget.catInsurance'),
+  'Mobilität':    t('budget.catMobility'),
+  'Freizeit':     t('budget.catLeisure'),
+  'Kleidung':     t('budget.catClothing'),
+  'Gesundheit':   t('budget.catHealth'),
+  'Bildung':      t('budget.catEducation'),
+  'Sonstiges':    t('budget.catMisc'),
+});
+
+function getMonthName(monthIndex) {
+  // monthIndex: 0-based (0=Januar, 11=Dezember)
+  const date = new Date(2000, monthIndex, 1);
+  return new Intl.DateTimeFormat(getLocale(), { month: 'long' }).format(date);
+}
 
 // --------------------------------------------------------
 // State
@@ -43,7 +59,7 @@ function formatAmount(n) {
 
 function formatMonthLabel(ym) {
   const [y, m] = ym.split('-');
-  return `${MONTH_NAMES[parseInt(m, 10) - 1]} ${y}`;
+  return `${getMonthName(parseInt(m, 10) - 1)} ${y}`;
 }
 
 function addMonths(ym, n) {
@@ -74,7 +90,7 @@ async function loadMonth(month) {
     state.entries     = [];
     state.summary     = { income: 0, expenses: 0, balance: 0, byCategory: [] };
     state.prevSummary = null;
-    window.oikos?.showToast('Budget konnte nicht geladen werden.', 'danger');
+    window.oikos?.showToast(t('budget.loadError'), 'danger');
   }
 }
 
@@ -89,24 +105,24 @@ export async function render(container, { user }) {
 
   container.innerHTML = `
     <div class="budget-page">
-      <h1 class="sr-only">Budget</h1>
+      <h1 class="sr-only">${t('budget.title')}</h1>
       <div class="budget-nav">
-        <button class="btn btn--icon" id="budget-prev" aria-label="Vorheriger Monat">
+        <button class="btn btn--icon" id="budget-prev" aria-label="${t('budget.prevMonth')}">
           <i data-lucide="chevron-left" aria-hidden="true"></i>
         </button>
-        <button class="budget-nav__today" id="budget-today">Aktuell</button>
+        <button class="budget-nav__today" id="budget-today">${t('budget.currentMonth')}</button>
         <span class="budget-nav__label" id="budget-label"></span>
-        <button class="btn btn--primary btn--icon" id="budget-add" aria-label="Eintrag hinzufügen">
+        <button class="btn btn--primary btn--icon" id="budget-add" aria-label="${t('budget.addEntryLabel')}">
           <i data-lucide="plus" aria-hidden="true"></i>
         </button>
-        <button class="btn btn--icon" id="budget-next" aria-label="Nächster Monat">
+        <button class="btn btn--icon" id="budget-next" aria-label="${t('budget.nextMonth')}">
           <i data-lucide="chevron-right" aria-hidden="true"></i>
         </button>
       </div>
       <div id="budget-body" style="flex:1;display:flex;flex-direction:column;overflow:hidden;">
-        <div style="padding:2rem;text-align:center;color:var(--color-text-disabled);">Lade…</div>
+        <div style="padding:2rem;text-align:center;color:var(--color-text-disabled);">${t('budget.loadingIndicator')}</div>
       </div>
-      <button class="page-fab" id="fab-new-budget" aria-label="Neuer Eintrag">
+      <button class="page-fab" id="fab-new-budget" aria-label="${t('budget.newEntryFabLabel')}">
         <i data-lucide="plus" style="width:24px;height:24px" aria-hidden="true"></i>
       </button>
     </div>
@@ -171,17 +187,17 @@ function renderBody() {
     <!-- Zusammenfassung -->
     <div class="budget-summary">
       <div class="budget-summary-card budget-summary-card--income">
-        <div class="budget-summary-card__label">Einnahmen</div>
+        <div class="budget-summary-card__label">${t('budget.income')}</div>
         <div class="budget-summary-card__amount">${formatAmount(s.income)}</div>
         ${p ? renderTrend(s.income, p.income, prevLabel) : ''}
       </div>
       <div class="budget-summary-card budget-summary-card--expenses">
-        <div class="budget-summary-card__label">Ausgaben</div>
+        <div class="budget-summary-card__label">${t('budget.expenses')}</div>
         <div class="budget-summary-card__amount">${formatAmount(Math.abs(s.expenses))}</div>
         ${p ? renderTrend(s.expenses, p.expenses, prevLabel) : ''}
       </div>
       <div class="budget-summary-card ${balanceClass}">
-        <div class="budget-summary-card__label">Saldo</div>
+        <div class="budget-summary-card__label">${t('budget.balance')}</div>
         <div class="budget-summary-card__amount">${formatAmount(s.balance)}</div>
         ${p ? renderTrend(s.balance, p.balance, prevLabel) : ''}
       </div>
@@ -190,7 +206,7 @@ function renderBody() {
     <!-- Kategorie-Balken -->
     ${s.byCategory.length ? `
     <div class="budget-chart-section">
-      <div class="budget-chart-section__title">Nach Kategorie</div>
+      <div class="budget-chart-section__title">${t('budget.byCategory')}</div>
       <div class="budget-chart">
         ${renderCategoryBars(s.byCategory)}
       </div>
@@ -199,7 +215,7 @@ function renderBody() {
     <!-- Transaktionsliste -->
     <div class="budget-list-section">
       <div class="budget-list-header">
-        <span class="budget-list-header__title">Transaktionen</span>
+        <span class="budget-list-header__title">${t('budget.transactions')}</span>
         ${state.entries.length ? `
         <a href="/api/v1/budget/export?month=${state.month}" class="btn btn--secondary"
            style="font-size:var(--text-sm);padding:var(--space-1) var(--space-3);">
@@ -256,8 +272,8 @@ function renderEntries() {
         <line x1="12" y1="1" x2="12" y2="23"/>
         <path d="M17 5H9.5a3.5 3.5 0 0 0 0 7h5a3.5 3.5 0 0 1 0 7H6"/>
       </svg>
-      <div class="empty-state__title">Keine Einträge diesen Monat</div>
-      <div class="empty-state__description">Budget-Einträge über den + Button hinzufügen.</div>
+      <div class="empty-state__title">${t('budget.emptyTitle')}</div>
+      <div class="empty-state__description">${t('budget.emptyDescription')}</div>
     </div>`;
   }
 
@@ -277,7 +293,7 @@ function renderEntries() {
           <div class="budget-entry__meta">${date} · ${escHtml(e.category)}${recurTag}</div>
         </div>
         <div class="budget-entry__amount ${amtClass}">${sign}${formatAmount(e.amount)}</div>
-        <button class="budget-entry__delete" data-action="delete" data-id="${e.id}" aria-label="Eintrag löschen">
+        <button class="budget-entry__delete" data-action="delete" data-id="${e.id}" aria-label="${t('budget.deleteLabel')}">
           <i data-lucide="trash-2" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
       </div>
@@ -298,7 +314,7 @@ function renderEntries() {
 function renderTrend(current, prev, prevLabel) {
   const delta = current - prev;
   if (Math.abs(delta) < 0.005) {
-    return `<div class="budget-summary-card__trend budget-summary-card__trend--neutral">— wie ${prevLabel}</div>`;
+    return `<div class="budget-summary-card__trend budget-summary-card__trend--neutral">${t('budget.trendNeutral', { month: prevLabel })}</div>`;
   }
   const positive = delta > 0;
   const arrow    = positive ? '▲' : '▼';
@@ -308,8 +324,7 @@ function renderTrend(current, prev, prevLabel) {
 }
 
 function formatEntryDate(dateStr) {
-  const d = new Date(dateStr + 'T00:00:00');
-  return `${d.getDate().toString().padStart(2, '0')}.${(d.getMonth() + 1).toString().padStart(2, '0')}.`;
+  return formatDate(new Date(dateStr + 'T00:00:00'));
 }
 
 // --------------------------------------------------------
@@ -323,38 +338,39 @@ function openBudgetModal({ mode, entry = null }) {
   const isExpense  = isEdit ? entry.amount < 0 : true;
   const absAmount  = isEdit ? Math.abs(entry.amount).toFixed(2) : '';
 
+  const catLabels = CATEGORY_LABELS();
   const catOpts = CATEGORIES.map((c) =>
-    `<option value="${c}" ${isEdit && entry.category === c ? 'selected' : ''}>${c}</option>`
+    `<option value="${c}" ${isEdit && entry.category === c ? 'selected' : ''}>${catLabels[c] || c}</option>`
   ).join('');
 
   const content = `
     <div class="amount-type-toggle">
       <button class="amount-type-btn amount-type-btn--expenses ${isExpense ? 'amount-type-btn--active' : ''}"
-              id="type-expense" type="button">Ausgabe</button>
+              id="type-expense" type="button">${t('budget.typeExpense')}</button>
       <button class="amount-type-btn amount-type-btn--income ${!isExpense ? 'amount-type-btn--active' : ''}"
-              id="type-income" type="button">Einnahme</button>
+              id="type-income" type="button">${t('budget.typeIncome')}</button>
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="bm-title">Titel *</label>
+      <label class="form-label" for="bm-title">${t('budget.titleLabel')}</label>
       <input type="text" class="form-input" id="bm-title"
-             placeholder="z.B. REWE Einkauf" value="${escHtml(isEdit ? entry.title : '')}">
+             placeholder="${t('budget.titlePlaceholder')}" value="${escHtml(isEdit ? entry.title : '')}">
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="bm-amount">Betrag (€) *</label>
+      <label class="form-label" for="bm-amount">${t('budget.amountLabel')}</label>
       <input type="number" class="form-input" id="bm-amount"
-             placeholder="0,00" step="0.01" min="0"
+             placeholder="${t('budget.amountPlaceholder')}" step="0.01" min="0"
              value="${absAmount}">
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="bm-category">Kategorie</label>
+      <label class="form-label" for="bm-category">${t('budget.categoryLabel')}</label>
       <select class="form-input" id="bm-category">${catOpts}</select>
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="bm-date">Datum *</label>
+      <label class="form-label" for="bm-date">${t('budget.dateLabel')}</label>
       <input type="date" class="form-input" id="bm-date"
              value="${isEdit ? entry.date : today}">
     </div>
@@ -362,22 +378,22 @@ function openBudgetModal({ mode, entry = null }) {
     <div class="form-group">
       <label class="allday-toggle">
         <input type="checkbox" id="bm-recurring" ${isEdit && entry.is_recurring ? 'checked' : ''}>
-        <span class="allday-toggle__label">Wiederkehrend</span>
+        <span class="allday-toggle__label">${t('budget.recurringLabel')}</span>
       </label>
     </div>
 
     <div class="modal-panel__footer" style="border:none;padding:0;margin-top:var(--space-4)">
-      ${isEdit ? `<button class="btn btn--danger btn--icon" id="bm-delete" aria-label="Eintrag löschen">
+      ${isEdit ? `<button class="btn btn--danger btn--icon" id="bm-delete" aria-label="${t('budget.deleteLabel')}">
         <i data-lucide="trash-2" style="width:16px;height:16px;" aria-hidden="true"></i>
       </button>` : '<div></div>'}
       <div style="display:flex;gap:var(--space-3)">
-        <button class="btn btn--secondary" id="bm-cancel">Abbrechen</button>
-        <button class="btn btn--primary" id="bm-save">${isEdit ? 'Speichern' : 'Hinzufügen'}</button>
+        <button class="btn btn--secondary" id="bm-cancel">${t('common.cancel')}</button>
+        <button class="btn btn--primary" id="bm-save">${isEdit ? t('common.save') : t('common.add')}</button>
       </div>
     </div>`;
 
   openSharedModal({
-    title: isEdit ? 'Eintrag bearbeiten' : 'Neuer Eintrag',
+    title: isEdit ? t('budget.editEntry') : t('budget.newEntry'),
     content,
     size: 'sm',
     onSave(panel) {
@@ -397,7 +413,7 @@ function openBudgetModal({ mode, entry = null }) {
       panel.querySelector('#bm-cancel').addEventListener('click', closeModal);
 
       panel.querySelector('#bm-delete')?.addEventListener('click', async () => {
-        if (!confirm(`"${entry.title}" wirklich löschen?`)) return;
+        if (!confirm(t('budget.deletePersonConfirm', { title: entry.title }))) return;
         closeModal();
         await deleteEntry(entry.id);
       });
@@ -410,9 +426,9 @@ function openBudgetModal({ mode, entry = null }) {
         const date       = panel.querySelector('#bm-date').value;
         const recurring  = panel.querySelector('#bm-recurring').checked ? 1 : 0;
 
-        if (!title)           { window.oikos?.showToast('Titel ist erforderlich', 'error'); return; }
-        if (isNaN(absVal) || absVal <= 0) { window.oikos?.showToast('Gültigen Betrag eingeben', 'error'); return; }
-        if (!date)            { window.oikos?.showToast('Datum ist erforderlich', 'error'); return; }
+        if (!title)           { window.oikos?.showToast(t('common.titleRequired'), 'error'); return; }
+        if (isNaN(absVal) || absVal <= 0) { window.oikos?.showToast(t('budget.validAmountRequired'), 'error'); return; }
+        if (!date)            { window.oikos?.showToast(t('budget.dateRequired'), 'error'); return; }
 
         const amount = currentType === 'expense' ? -absVal : absVal;
 
@@ -434,11 +450,11 @@ function openBudgetModal({ mode, entry = null }) {
 
           closeModal();
           renderBody();
-          window.oikos?.showToast(mode === 'create' ? 'Eintrag hinzugefügt' : 'Eintrag gespeichert', 'success');
+          window.oikos?.showToast(mode === 'create' ? t('budget.addedToast') : t('budget.savedToast'), 'success');
         } catch (err) {
-          window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+          window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
           saveBtn.disabled    = false;
-          saveBtn.textContent = isEdit ? 'Speichern' : 'Hinzufügen';
+          saveBtn.textContent = isEdit ? t('common.save') : t('common.add');
         }
       });
     },
@@ -450,7 +466,7 @@ function openBudgetModal({ mode, entry = null }) {
 // --------------------------------------------------------
 
 async function deleteEntry(id) {
-  if (!confirm('Eintrag wirklich löschen?')) return;
+  if (!confirm(t('budget.deleteConfirm'))) return;
   try {
     await api.delete(`/budget/${id}`);
     state.entries = state.entries.filter((e) => e.id !== id);
@@ -458,9 +474,9 @@ async function deleteEntry(id) {
     state.summary = sumRes.data;
     renderBody();
     vibrate([30, 50, 30]);
-    window.oikos?.showToast('Eintrag gelöscht', 'success');
+    window.oikos?.showToast(t('budget.deletedToast'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
   }
 }
 
diff --git a/public/pages/calendar.js b/public/pages/calendar.js
index 4174ee4..6f881c0 100644
--- a/public/pages/calendar.js
+++ b/public/pages/calendar.js
@@ -8,17 +8,35 @@ import { api } from '/api.js';
 import { renderRRuleFields, bindRRuleEvents, getRRuleValues } from '/rrule-ui.js';
 import { openModal as openSharedModal, closeModal } from '/components/modal.js';
 import { stagger } from '/utils/ux.js';
+import { t, formatTime } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
 // --------------------------------------------------------
 
 const VIEWS      = ['month', 'week', 'day', 'agenda'];
-const VIEW_LABELS = { month: 'Monat', week: 'Woche', day: 'Tag', agenda: 'Agenda' };
-const DAY_NAMES_SHORT = ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'];
-const DAY_NAMES_LONG  = ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'];
-const MONTH_NAMES     = ['Januar', 'Februar', 'März', 'April', 'Mai', 'Juni',
-                          'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'];
+const VIEW_LABELS = () => ({
+  month: t('calendar.viewMonth'),
+  week:  t('calendar.viewWeek'),
+  day:   t('calendar.viewDay'),
+  agenda: t('calendar.viewAgenda'),
+});
+const DAY_NAMES_SHORT = () => [
+  t('calendar.dayShortSunday'), t('calendar.dayShortMonday'), t('calendar.dayShortTuesday'),
+  t('calendar.dayShortWednesday'), t('calendar.dayShortThursday'), t('calendar.dayShortFriday'),
+  t('calendar.dayShortSaturday'),
+];
+const DAY_NAMES_LONG  = () => [
+  t('calendar.dayLongSunday'), t('calendar.dayLongMonday'), t('calendar.dayLongTuesday'),
+  t('calendar.dayLongWednesday'), t('calendar.dayLongThursday'), t('calendar.dayLongFriday'),
+  t('calendar.dayLongSaturday'),
+];
+const MONTH_NAMES     = () => [
+  t('calendar.monthJanuary'), t('calendar.monthFebruary'), t('calendar.monthMarch'),
+  t('calendar.monthApril'), t('calendar.monthMay'), t('calendar.monthJune'),
+  t('calendar.monthJuly'), t('calendar.monthAugust'), t('calendar.monthSeptember'),
+  t('calendar.monthOctober'), t('calendar.monthNovember'), t('calendar.monthDecember'),
+];
 
 const EVENT_COLORS = [
   '#007AFF', '#34C759', '#FF9500', '#FF3B30',
@@ -73,25 +91,20 @@ function getMondayOf(dateStr) {
 function formatDate(dateStr, { long = false, weekday = false } = {}) {
   const d   = new Date(dateStr + 'T00:00:00');
   const day = d.getDate();
-  const mon = MONTH_NAMES[d.getMonth()];
+  const mon = MONTH_NAMES()[d.getMonth()];
   if (weekday) {
-    const wd = long ? DAY_NAMES_LONG[d.getDay()] : DAY_NAMES_SHORT[d.getDay()];
+    const wd = long ? DAY_NAMES_LONG()[d.getDay()] : DAY_NAMES_SHORT()[d.getDay()];
     return `${wd}, ${day}. ${mon}`;
   }
   return `${day}. ${mon} ${d.getFullYear()}`;
 }
 
-function formatTime(datetimeStr) {
-  if (!datetimeStr) return '';
-  const t = datetimeStr.slice(11, 16);
-  return t || '';
-}
-
 function formatDateTime(datetimeStr) {
   if (!datetimeStr) return '';
   const date = datetimeStr.slice(0, 10);
-  const time = datetimeStr.slice(11, 16);
-  return time ? `${formatDate(date)} ${time} Uhr` : formatDate(date);
+  const hasTime = datetimeStr.length > 10 && datetimeStr.slice(11, 16).trim() !== '';
+  const time = hasTime ? formatTime(datetimeStr) : '';
+  return time ? `${formatDate(date)} ${time} ${t('calendar.timeSuffix')}`.trimEnd() : formatDate(date);
 }
 
 function getMonthRange(dateStr) {
@@ -132,7 +145,7 @@ async function loadRange(from, to) {
   } catch (err) {
     console.error('[Calendar] loadRange Fehler:', err);
     state.events = [];
-    window.oikos?.showToast('Termine konnten nicht geladen werden.', 'danger');
+    window.oikos?.showToast(t('calendar.loadError'), 'danger');
   }
   state.rangeFrom = from;
   state.rangeTo   = to;
@@ -161,7 +174,7 @@ export async function render(container, { user }) {
     <div class="calendar-page" id="calendar-page">
       <div class="cal-toolbar" id="cal-toolbar"></div>
       <div id="cal-body" style="flex:1;display:flex;flex-direction:column;overflow:hidden;"></div>
-      <button class="page-fab" id="fab-new-event" aria-label="Neuer Termin">
+      <button class="page-fab" id="fab-new-event" aria-label="${t('calendar.newEvent')}">
         <i data-lucide="plus" style="width:24px;height:24px" aria-hidden="true"></i>
       </button>
     </div>
@@ -185,26 +198,26 @@ function renderToolbar() {
   if (!bar) return;
 
   bar.innerHTML = `
-    <h1 class="sr-only">Kalender</h1>
+    <h1 class="sr-only">${t('calendar.title')}</h1>
     <div class="cal-toolbar__nav">
-      <button class="btn btn--icon" id="cal-prev" aria-label="Zurück">
+      <button class="btn btn--icon" id="cal-prev" aria-label="${t('calendar.back')}">
         <i data-lucide="chevron-left" aria-hidden="true"></i>
       </button>
     </div>
-    <button class="cal-toolbar__today" id="cal-today">Heute</button>
+    <button class="cal-toolbar__today" id="cal-today">${t('calendar.today')}</button>
     <span class="cal-toolbar__label" id="cal-label"></span>
     <div class="cal-toolbar__views">
       ${VIEWS.map((v) => `
         <button class="cal-toolbar__view-btn ${v === state.view ? 'cal-toolbar__view-btn--active' : ''}"
-                data-view="${v}">${VIEW_LABELS[v]}</button>
+                data-view="${v}">${VIEW_LABELS()[v]}</button>
       `).join('')}
     </div>
-    <button class="btn btn--primary btn--icon" id="cal-add" aria-label="Termin hinzufügen"
+    <button class="btn btn--primary btn--icon" id="cal-add" aria-label="${t('calendar.addEvent')}"
             style="margin-left:auto;">
       <i data-lucide="plus" aria-hidden="true"></i>
     </button>
     <div class="cal-toolbar__nav">
-      <button class="btn btn--icon" id="cal-next" aria-label="Weiter">
+      <button class="btn btn--icon" id="cal-next" aria-label="${t('calendar.forward')}">
         <i data-lucide="chevron-right" aria-hidden="true"></i>
       </button>
     </div>
@@ -237,12 +250,12 @@ function updateLabel() {
   if (!lbl) return;
   const d    = new Date(state.cursor + 'T00:00:00');
   const year = d.getFullYear();
-  const mon  = MONTH_NAMES[d.getMonth()];
+  const mon  = MONTH_NAMES()[d.getMonth()];
 
   if (state.view === 'month')  lbl.textContent = `${mon} ${year}`;
-  if (state.view === 'week')   lbl.textContent = `KW ${getWeekNumber(state.cursor)} · ${mon} ${year}`;
+  if (state.view === 'week')   lbl.textContent = t('calendar.weekNumberLabel', { week: getWeekNumber(state.cursor), month: mon, year });
   if (state.view === 'day')    lbl.textContent = formatDate(state.cursor, { weekday: true, long: true });
-  if (state.view === 'agenda') lbl.textContent = `Ab ${formatDate(state.cursor)}`;
+  if (state.view === 'agenda') lbl.textContent = t('calendar.agendaFrom', { date: formatDate(state.cursor) });
 }
 
 function getWeekNumber(dateStr) {
@@ -328,7 +341,7 @@ function renderMonthView(container) {
   container.innerHTML = `
     <div class="month-view">
       <div class="month-weekdays">
-        ${['Mo','Di','Mi','Do','Fr','Sa','So'].map((n) => `<div class="month-weekday">${n}</div>`).join('')}
+        ${[t('calendar.dayShortMonday'),t('calendar.dayShortTuesday'),t('calendar.dayShortWednesday'),t('calendar.dayShortThursday'),t('calendar.dayShortFriday'),t('calendar.dayShortSaturday'),t('calendar.dayShortSunday')].map((n) => `<div class="month-weekday">${n}</div>`).join('')}
       </div>
       <div class="month-grid" id="month-grid">
         ${days.map(({ date, inMonth }) => renderMonthDay(date, inMonth)).join('')}
@@ -376,7 +389,7 @@ function renderMonthDay(date, inMonth) {
     <div class="${classes}" data-date="${date}">
       <div class="month-day__number">${new Date(date + 'T00:00:00').getDate()}</div>
       ${evHtml}
-      ${extra > 0 ? `<div class="month-day__more">+${extra} weitere</div>` : ''}
+      ${extra > 0 ? `<div class="month-day__more">${t('calendar.moreEvents', { count: extra })}</div>` : ''}
     </div>
   `;
 }
@@ -404,14 +417,14 @@ function renderWeekView(container) {
         ${days.map((d) => {
           const dt = new Date(d + 'T00:00:00');
           return `<div class="week-view__day-header">
-            <div class="week-view__day-name">${DAY_NAMES_SHORT[(dt.getDay())]}</div>
+            <div class="week-view__day-name">${DAY_NAMES_SHORT()[dt.getDay()]}</div>
             <div class="week-view__day-num ${d === state.today ? 'week-view__day-num--today' : ''}">${dt.getDate()}</div>
           </div>`;
         }).join('')}
       </div>
       <!-- Ganztägige Ereignisse -->
       <div class="allday-row" style="display:grid;grid-template-columns:48px repeat(7,1fr);">
-        <div style="width:48px;padding:2px;font-size:10px;color:var(--color-text-disabled);text-align:right;padding-right:4px;line-height:24px;">ganztg.</div>
+        <div style="width:48px;padding:2px;font-size:10px;color:var(--color-text-disabled);text-align:right;padding-right:4px;line-height:24px;">${t('calendar.allDayShort')}</div>
         ${days.map((d, i) => `
           <div class="allday-cell">
             ${alldayEvs[i].map((ev) => `
@@ -523,7 +536,7 @@ function renderDayView(container) {
       </div>
       ${allday.length ? `
       <div class="allday-row" style="display:grid;grid-template-columns:48px 1fr;">
-        <div style="padding:2px 4px 2px 0;font-size:10px;color:var(--color-text-disabled);text-align:right;line-height:24px;">ganztg.</div>
+        <div style="padding:2px 4px 2px 0;font-size:10px;color:var(--color-text-disabled);text-align:right;line-height:24px;">${t('calendar.allDayShort')}</div>
         <div class="allday-cell">
           ${allday.map((ev) => `
             <div class="allday-event" data-id="${ev.id}" style="background-color:${escHtml(ev.color)};">
@@ -584,12 +597,12 @@ function renderAgendaView(container) {
   container.innerHTML = `
     <div class="agenda-view" id="agenda-view">
       ${groups.length === 0
-        ? `<div class="agenda-empty">Keine Termine im gewählten Zeitraum.</div>`
+        ? `<div class="agenda-empty">${t('calendar.noEvents')}</div>`
         : groups.map(({ date, events }) => `
           <div class="agenda-day">
             <div class="agenda-day__header ${date === state.today ? 'agenda-day__header--today' : ''}">
               <span class="agenda-day__date">${formatDate(date)}</span>
-              <span class="agenda-day__weekday">${DAY_NAMES_LONG[new Date(date + 'T00:00:00').getDay()]}</span>
+              <span class="agenda-day__weekday">${DAY_NAMES_LONG()[new Date(date + 'T00:00:00').getDay()]}</span>
             </div>
             ${events.map((ev) => renderAgendaEvent(ev)).join('')}
           </div>
@@ -611,9 +624,9 @@ function renderAgendaView(container) {
 
 function renderAgendaEvent(ev) {
   const timeStr = ev.all_day
-    ? 'Ganztägig'
+    ? t('calendar.allDay')
     : formatTime(ev.start_datetime)
-      + (ev.end_datetime ? ` – ${formatTime(ev.end_datetime)} Uhr` : ' Uhr');
+      + (ev.end_datetime ? ` – ${formatTime(ev.end_datetime)} ${t('calendar.timeSuffix')}`.trimEnd() : ` ${t('calendar.timeSuffix')}`.trimEnd());
 
   const initials = ev.assigned_name
     ? ev.assigned_name.split(' ').map((w) => w[0]).join('').toUpperCase().slice(0, 2)
@@ -650,9 +663,9 @@ function showEventPopup(ev, anchor) {
   popup.className = 'event-popup';
 
   const timeStr = ev.all_day
-    ? 'Ganztägig'
+    ? t('calendar.allDay')
     : formatDateTime(ev.start_datetime)
-      + (ev.end_datetime ? ` – ${formatTime(ev.end_datetime)} Uhr` : '');
+      + (ev.end_datetime ? ` – ${formatTime(ev.end_datetime)}${t('calendar.timeSuffix') ? ' ' + t('calendar.timeSuffix') : ''}`.trim() : '');
 
   popup.innerHTML = `
     <div class="event-popup__color-bar" style="background-color:${escHtml(ev.color)};"></div>
@@ -664,7 +677,7 @@ function showEventPopup(ev, anchor) {
       ${ev.assigned_name ? `<div>👤 ${escHtml(ev.assigned_name)}</div>` : ''}
     </div>
     <div class="event-popup__actions">
-      <button class="btn btn--secondary" style="flex:1;" id="popup-edit">Bearbeiten</button>
+      <button class="btn btn--secondary" style="flex:1;" id="popup-edit">${t('calendar.popupEdit')}</button>
       <button class="btn btn--danger"    id="popup-delete">
         <i data-lucide="trash-2" style="width:16px;height:16px;" aria-hidden="true"></i>
       </button>
@@ -687,7 +700,7 @@ function showEventPopup(ev, anchor) {
   });
 
   popup.querySelector('#popup-delete').addEventListener('click', async () => {
-    if (!confirm(`"${ev.title}" wirklich löschen?`)) return;
+    if (!confirm(t('calendar.deleteConfirm', { title: ev.title }))) return;
     popup.remove();
     await deleteEvent(ev.id);
   });
@@ -712,7 +725,7 @@ function openEventModal({ mode, event = null, date = null }) {
   const content = buildEventModalContent({ mode, event, date });
 
   openSharedModal({
-    title: isEdit ? 'Termin bearbeiten' : 'Neuer Termin',
+    title: isEdit ? t('calendar.editEvent') : t('calendar.newEvent'),
     content,
     size: 'md',
     onSave(panel) {
@@ -745,7 +758,7 @@ function openEventModal({ mode, event = null, date = null }) {
       panel.querySelector('#modal-cancel').addEventListener('click', closeModal);
 
       panel.querySelector('#modal-delete')?.addEventListener('click', async () => {
-        if (!confirm(`"${event.title}" wirklich löschen?`)) return;
+        if (!confirm(t('calendar.deleteConfirm', { title: event.title }))) return;
         closeModal();
         await deleteEvent(event.id);
       });
@@ -767,7 +780,7 @@ function buildEventModalContent({ mode, event, date }) {
     ? event.end_datetime.slice(11, 16) : '10:00';
 
   const userOpts = [
-    '<option value="">— Niemand —</option>',
+    `<option value="">${t('calendar.assignedNobody')}</option>`,
     ...state.users.map((u) =>
       `<option value="${u.id}" ${isEdit && event.assigned_to === u.id ? 'selected' : ''}>${escHtml(u.display_name)}</option>`
     ),
@@ -775,36 +788,36 @@ function buildEventModalContent({ mode, event, date }) {
 
   return `
     <div class="form-group">
-      <label class="form-label" for="modal-title">Titel *</label>
+      <label class="form-label" for="modal-title">${t('calendar.titleLabel')}</label>
       <input type="text" class="form-input" id="modal-title"
-             placeholder="z.B. Zahnarzt" value="${escHtml(isEdit ? event.title : '')}">
+             placeholder="${t('calendar.titlePlaceholder')}" value="${escHtml(isEdit ? event.title : '')}">
     </div>
 
     <div class="form-group">
       <label class="allday-toggle">
         <input type="checkbox" id="modal-allday" ${isEdit && event.all_day ? 'checked' : ''}>
-        <span class="allday-toggle__label">Ganztägig</span>
+        <span class="allday-toggle__label">${t('calendar.allDayToggle')}</span>
       </label>
     </div>
 
     <div id="time-fields">
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)">
         <div class="form-group">
-          <label class="form-label" for="modal-start-date">Startdatum</label>
+          <label class="form-label" for="modal-start-date">${t('calendar.startDateLabel')}</label>
           <input type="date" class="form-input" id="modal-start-date" value="${startDate}">
         </div>
         <div class="form-group">
-          <label class="form-label" for="modal-start-time">Startzeit</label>
+          <label class="form-label" for="modal-start-time">${t('calendar.startTimeLabel')}</label>
           <input type="time" class="form-input" id="modal-start-time" value="${startTime}">
         </div>
       </div>
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)">
         <div class="form-group">
-          <label class="form-label" for="modal-end-date">Enddatum</label>
+          <label class="form-label" for="modal-end-date">${t('calendar.endDateLabel')}</label>
           <input type="date" class="form-input" id="modal-end-date" value="${endDate}">
         </div>
         <div class="form-group">
-          <label class="form-label" for="modal-end-time">Endzeit</label>
+          <label class="form-label" for="modal-end-time">${t('calendar.endTimeLabel')}</label>
           <input type="time" class="form-input" id="modal-end-time" value="${endTime}">
         </div>
       </div>
@@ -813,52 +826,52 @@ function buildEventModalContent({ mode, event, date }) {
     <div id="allday-fields" style="display:none;">
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)">
         <div class="form-group">
-          <label class="form-label" for="modal-allday-start">Von</label>
+          <label class="form-label" for="modal-allday-start">${t('calendar.fromLabel')}</label>
           <input type="date" class="form-input" id="modal-allday-start" value="${startDate}">
         </div>
         <div class="form-group">
-          <label class="form-label" for="modal-allday-end">Bis</label>
+          <label class="form-label" for="modal-allday-end">${t('calendar.toLabel')}</label>
           <input type="date" class="form-input" id="modal-allday-end" value="${endDate}">
         </div>
       </div>
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="modal-location">Ort</label>
+      <label class="form-label" for="modal-location">${t('calendar.locationLabel')}</label>
       <input type="text" class="form-input" id="modal-location"
-             placeholder="Optional" value="${escHtml(isEdit && event.location ? event.location : '')}">
+             placeholder="${t('calendar.locationPlaceholder')}" value="${escHtml(isEdit && event.location ? event.location : '')}">
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="modal-assigned">Zugewiesen an</label>
+      <label class="form-label" for="modal-assigned">${t('calendar.assignedLabel')}</label>
       <select class="form-input" id="modal-assigned">${userOpts}</select>
     </div>
 
     <div class="form-group">
-      <label class="form-label">Farbe</label>
+      <label class="form-label">${t('calendar.colorLabel')}</label>
       <div class="color-picker">
         ${EVENT_COLORS.map((c) => `
           <div class="color-swatch" data-color="${c}" style="background-color:${c};"
-               role="radio" tabindex="0" aria-label="Farbe ${c}"></div>
+               role="radio" tabindex="0" aria-label="${t('calendar.colorLabel', { color: c })}"></div>
         `).join('')}
       </div>
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="modal-description">Beschreibung</label>
+      <label class="form-label" for="modal-description">${t('calendar.descriptionLabel')}</label>
       <textarea class="form-input" id="modal-description" rows="2"
-                placeholder="Optional…">${escHtml(isEdit && event.description ? event.description : '')}</textarea>
+                placeholder="${t('calendar.descriptionPlaceholder')}">${escHtml(isEdit && event.description ? event.description : '')}</textarea>
     </div>
 
     ${renderRRuleFields('event', isEdit ? event.recurrence_rule : null)}
 
     <div class="modal-panel__footer" style="border:none;padding:0;margin-top:var(--space-4)">
-      ${isEdit ? `<button class="btn btn--danger btn--icon" id="modal-delete" aria-label="Termin löschen">
+      ${isEdit ? `<button class="btn btn--danger btn--icon" id="modal-delete" aria-label="${t('calendar.deleteEvent')}">
         <i data-lucide="trash-2" style="width:16px;height:16px;" aria-hidden="true"></i>
       </button>` : '<div></div>'}
       <div style="display:flex;gap:var(--space-3)">
-        <button class="btn btn--secondary" id="modal-cancel">Abbrechen</button>
-        <button class="btn btn--primary" id="modal-save">${isEdit ? 'Speichern' : 'Erstellen'}</button>
+        <button class="btn btn--secondary" id="modal-cancel">${t('common.cancel')}</button>
+        <button class="btn btn--primary" id="modal-save">${isEdit ? t('common.save') : t('common.create')}</button>
       </div>
     </div>`;
 }
@@ -868,7 +881,7 @@ async function saveEvent(overlay, mode, eventId) {
   const title   = overlay.querySelector('#modal-title').value.trim();
 
   if (!title) {
-    window.oikos?.showToast('Titel ist erforderlich', 'error');
+    window.oikos?.showToast(t('calendar.titleRequired'), 'error');
     return;
   }
 
@@ -918,11 +931,11 @@ async function saveEvent(overlay, mode, eventId) {
 
     closeModal();
     renderView();
-    window.oikos?.showToast(mode === 'create' ? 'Termin erstellt' : 'Termin gespeichert', 'success');
+    window.oikos?.showToast(mode === 'create' ? t('calendar.createdToast') : t('calendar.savedToast'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler beim Speichern', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('calendar.saveError'), 'error');
     saveBtn.disabled    = false;
-    saveBtn.textContent = mode === 'edit' ? 'Speichern' : 'Erstellen';
+    saveBtn.textContent = mode === 'edit' ? t('common.save') : t('common.create');
   }
 }
 
@@ -931,9 +944,9 @@ async function deleteEvent(id) {
     await api.delete(`/calendar/${id}`);
     state.events = state.events.filter((e) => e.id !== id);
     renderView();
-    window.oikos?.showToast('Termin gelöscht', 'success');
+    window.oikos?.showToast(t('calendar.deletedToast'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler beim Löschen', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('calendar.deleteError'), 'error');
   }
 }
 
diff --git a/public/pages/contacts.js b/public/pages/contacts.js
index a19b225..f64a326 100644
--- a/public/pages/contacts.js
+++ b/public/pages/contacts.js
@@ -7,6 +7,7 @@
 import { api } from '/api.js';
 import { openModal as openSharedModal, closeModal } from '/components/modal.js';
 import { stagger, vibrate } from '/utils/ux.js';
+import { t } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
@@ -25,6 +26,18 @@ const CATEGORY_ICONS = {
   'Sonstiges':    '📋',
 };
 
+function CATEGORY_LABELS() {
+  return {
+    'Arzt':         t('contacts.categoryDoctor'),
+    'Schule/Kita':  t('contacts.categorySchool'),
+    'Behörde':      t('contacts.categoryAuthority'),
+    'Versicherung': t('contacts.categoryInsurance'),
+    'Handwerker':   t('contacts.categoryCraftsman'),
+    'Notfall':      t('contacts.categoryEmergency'),
+    'Sonstiges':    t('contacts.categoryOther'),
+  };
+}
+
 // --------------------------------------------------------
 // State
 // --------------------------------------------------------
@@ -44,32 +57,32 @@ export async function render(container, { user }) {
   _container = container;
   container.innerHTML = `
     <div class="contacts-page">
-      <h1 class="sr-only">Kontakte</h1>
+      <h1 class="sr-only">${t('contacts.title')}</h1>
       <div class="contacts-toolbar">
         <div class="contacts-toolbar__search">
           <i data-lucide="search" class="contacts-toolbar__search-icon" aria-hidden="true"></i>
           <input type="search" class="contacts-toolbar__search-input"
-                 id="contacts-search" placeholder="Name, Telefon oder E-Mail suchen…"
+                 id="contacts-search" placeholder="${t('contacts.searchPlaceholder')}"
                  autocomplete="off">
         </div>
-        <label class="btn btn--secondary" title="vCard importieren" aria-label="Kontakt aus vCard importieren">
+        <label class="btn btn--secondary" title="${t('contacts.importTooltip')}" aria-label="${t('contacts.importLabel')}">
           <i data-lucide="upload" style="width:16px;height:16px;margin-right:4px;" aria-hidden="true"></i>
-          Import
+          ${t('contacts.importButton')}
           <input type="file" id="contacts-import-input" accept=".vcf,text/vcard" style="display:none">
         </label>
         <button class="btn btn--primary" id="contacts-add-btn">
           <i data-lucide="plus" style="width:16px;height:16px;margin-right:4px;" aria-hidden="true"></i>
-          Neu
+          ${t('contacts.addButton')}
         </button>
       </div>
       <div class="contacts-filters" id="contacts-filters">
-        <button class="contact-filter-chip contact-filter-chip--active" data-cat="">Alle</button>
+        <button class="contact-filter-chip contact-filter-chip--active" data-cat="">${t('contacts.filterAll')}</button>
         ${CATEGORIES.map((c) => `
-          <button class="contact-filter-chip" data-cat="${escHtml(c)}">${CATEGORY_ICONS[c] || ''} ${escHtml(c)}</button>
+          <button class="contact-filter-chip" data-cat="${escHtml(c)}">${CATEGORY_ICONS[c] || ''} ${CATEGORY_LABELS()[c] || escHtml(c)}</button>
         `).join('')}
       </div>
       <div id="contacts-list" class="contacts-list"></div>
-      <button class="page-fab" id="fab-new-contact" aria-label="Neuer Kontakt">
+      <button class="page-fab" id="fab-new-contact" aria-label="${t('contacts.newContactLabel')}">
         <i data-lucide="plus" style="width:24px;height:24px" aria-hidden="true"></i>
       </button>
     </div>
@@ -115,13 +128,13 @@ export async function render(container, { user }) {
     try {
       const text    = await file.text();
       const contact = parseVCard(text);
-      if (!contact.name) { window.oikos?.showToast('vCard enthält keinen Namen.', 'warning'); return; }
+      if (!contact.name) { window.oikos?.showToast(t('contacts.vcardNoName'), 'warning'); return; }
       const res = await api.post('/contacts', contact);
       state.contacts.push(res.data);
       renderList();
-      window.oikos?.showToast(`${res.data.name} importiert.`, 'success');
+      window.oikos?.showToast(t('contacts.importedToast', { name: res.data.name }), 'success');
     } catch (err) {
-      window.oikos?.showToast('Import fehlgeschlagen: ' + err.message, 'danger');
+      window.oikos?.showToast(t('contacts.importError', { error: err.message }), 'danger');
     }
   });
 }
@@ -164,8 +177,8 @@ function renderList() {
           <path d="M23 21v-2a4 4 0 0 0-3-3.87"/>
           <path d="M16 3.13a4 4 0 0 1 0 7.75"/>
         </svg>
-        <div class="empty-state__title">Noch keine Kontakte</div>
-        <div class="empty-state__description">Neue Kontakte über den + Button hinzufügen.</div>
+        <div class="empty-state__title">${t('contacts.emptyTitle')}</div>
+        <div class="empty-state__description">${t('contacts.emptyDescription')}</div>
       </div>
     `;
     if (window.lucide) lucide.createIcons();
@@ -183,7 +196,7 @@ function renderList() {
     .sort(([a], [b]) => CATEGORIES.indexOf(a) - CATEGORIES.indexOf(b))
     .map(([cat, items]) => `
       <div class="contact-group">
-        <div class="contact-group__header">${CATEGORY_ICONS[cat] || ''} ${escHtml(cat)}</div>
+        <div class="contact-group__header">${CATEGORY_ICONS[cat] || ''} ${CATEGORY_LABELS()[cat] || escHtml(cat)}</div>
         ${items.map((c) => renderContactItem(c)).join('')}
       </div>
     `).join('');
@@ -207,9 +220,9 @@ function renderList() {
 }
 
 function renderContactItem(c) {
-  const phone   = c.phone  ? `<a href="tel:${escHtml(c.phone)}"   class="contact-action-btn contact-action-btn--call"  aria-label="Anrufen"><i data-lucide="phone" style="width:16px;height:16px;" aria-hidden="true"></i></a>` : '';
-  const email   = c.email  ? `<a href="mailto:${escHtml(c.email)}" class="contact-action-btn contact-action-btn--mail"  aria-label="E-Mail"><i data-lucide="mail" style="width:16px;height:16px;" aria-hidden="true"></i></a>` : '';
-  const maps    = c.address ? `<a href="https://maps.google.com/?q=${encodeURIComponent(c.address)}" target="_blank" rel="noopener" class="contact-action-btn contact-action-btn--maps" aria-label="In Maps öffnen"><i data-lucide="map-pin" style="width:16px;height:16px;" aria-hidden="true"></i></a>` : '';
+  const phone   = c.phone  ? `<a href="tel:${escHtml(c.phone)}"   class="contact-action-btn contact-action-btn--call"  aria-label="${t('contacts.callLabel')}"><i data-lucide="phone" style="width:16px;height:16px;" aria-hidden="true"></i></a>` : '';
+  const email   = c.email  ? `<a href="mailto:${escHtml(c.email)}" class="contact-action-btn contact-action-btn--mail"  aria-label="${t('contacts.emailActionLabel')}"><i data-lucide="mail" style="width:16px;height:16px;" aria-hidden="true"></i></a>` : '';
+  const maps    = c.address ? `<a href="https://maps.google.com/?q=${encodeURIComponent(c.address)}" target="_blank" rel="noopener" class="contact-action-btn contact-action-btn--maps" aria-label="${t('contacts.mapsLabel')}"><i data-lucide="map-pin" style="width:16px;height:16px;" aria-hidden="true"></i></a>` : '';
   const meta    = [c.phone, c.email].filter(Boolean).join(' · ');
 
   return `
@@ -222,10 +235,10 @@ function renderContactItem(c) {
       <div class="contact-item__actions">
         ${phone}${email}${maps}
         <a href="/api/v1/contacts/${c.id}/vcard" download="${escHtml(c.name)}.vcf"
-           class="contact-action-btn" aria-label="Als vCard exportieren" title="vCard exportieren">
+           class="contact-action-btn" aria-label="${t('contacts.exportLabel')}" title="${t('contacts.exportTooltip')}">
           <i data-lucide="download" style="width:16px;height:16px;" aria-hidden="true"></i>
         </a>
-        <button class="contact-action-btn" data-action="delete" data-id="${c.id}" aria-label="Kontakt löschen">
+        <button class="contact-action-btn" data-action="delete" data-id="${c.id}" aria-label="${t('contacts.deleteLabel')}">
           <i data-lucide="trash-2" style="width:16px;height:16px;" aria-hidden="true"></i>
         </button>
       </div>
@@ -241,55 +254,56 @@ function openContactModal({ mode, contact = null }) {
   const isEdit = mode === 'edit';
   const v      = (field) => escHtml(isEdit && contact[field] ? contact[field] : '');
 
+  const catLabels = CATEGORY_LABELS();
   const catOpts = CATEGORIES.map((c) =>
-    `<option value="${c}" ${isEdit && contact.category === c ? 'selected' : ''}>${c}</option>`
+    `<option value="${c}" ${isEdit && contact.category === c ? 'selected' : ''}>${catLabels[c] || escHtml(c)}</option>`
   ).join('');
 
   const content = `
     <div class="form-group">
-      <label class="form-label" for="cm-name">Name *</label>
-      <input type="text" class="form-input" id="cm-name" placeholder="Vollständiger Name" value="${v('name')}">
+      <label class="form-label" for="cm-name">${t('contacts.nameLabel')}</label>
+      <input type="text" class="form-input" id="cm-name" placeholder="${t('contacts.namePlaceholder')}" value="${v('name')}">
     </div>
     <div class="form-group">
-      <label class="form-label" for="cm-category">Kategorie</label>
+      <label class="form-label" for="cm-category">${t('contacts.categoryLabel')}</label>
       <select class="form-input" id="cm-category">${catOpts}</select>
     </div>
     <div class="form-group">
-      <label class="form-label" for="cm-phone">Telefon</label>
-      <input type="tel" class="form-input" id="cm-phone" placeholder="+49 …" value="${v('phone')}">
+      <label class="form-label" for="cm-phone">${t('contacts.phoneLabel')}</label>
+      <input type="tel" class="form-input" id="cm-phone" placeholder="${t('contacts.phonePlaceholder')}" value="${v('phone')}">
     </div>
     <div class="form-group">
-      <label class="form-label" for="cm-email">E-Mail</label>
-      <input type="email" class="form-input" id="cm-email" placeholder="name@beispiel.de" value="${v('email')}">
+      <label class="form-label" for="cm-email">${t('contacts.emailLabel')}</label>
+      <input type="email" class="form-input" id="cm-email" placeholder="${t('contacts.emailPlaceholder')}" value="${v('email')}">
     </div>
     <div class="form-group">
-      <label class="form-label" for="cm-address">Adresse</label>
-      <input type="text" class="form-input" id="cm-address" placeholder="Straße, PLZ Ort" value="${v('address')}">
+      <label class="form-label" for="cm-address">${t('contacts.addressLabel')}</label>
+      <input type="text" class="form-input" id="cm-address" placeholder="${t('contacts.addressPlaceholder')}" value="${v('address')}">
     </div>
     <div class="form-group">
-      <label class="form-label" for="cm-notes">Notizen</label>
-      <textarea class="form-input" id="cm-notes" rows="2" placeholder="Optional…">${v('notes')}</textarea>
+      <label class="form-label" for="cm-notes">${t('contacts.notesLabel')}</label>
+      <textarea class="form-input" id="cm-notes" rows="2" placeholder="${t('contacts.notesPlaceholder')}">${v('notes')}</textarea>
     </div>
 
     <div class="modal-panel__footer" style="border:none;padding:0;margin-top:var(--space-4)">
-      ${isEdit ? `<button class="btn btn--danger btn--icon" id="cm-delete" aria-label="Kontakt löschen">
+      ${isEdit ? `<button class="btn btn--danger btn--icon" id="cm-delete" aria-label="${t('contacts.deleteLabel')}">
         <i data-lucide="trash-2" style="width:16px;height:16px;" aria-hidden="true"></i>
       </button>` : '<div></div>'}
       <div style="display:flex;gap:var(--space-3);">
-        <button class="btn btn--secondary" id="cm-cancel">Abbrechen</button>
-        <button class="btn btn--primary" id="cm-save">${isEdit ? 'Speichern' : 'Erstellen'}</button>
+        <button class="btn btn--secondary" id="cm-cancel">${t('common.cancel')}</button>
+        <button class="btn btn--primary" id="cm-save">${isEdit ? t('common.save') : t('common.create')}</button>
       </div>
     </div>`;
 
   openSharedModal({
-    title: isEdit ? 'Kontakt bearbeiten' : 'Neuer Kontakt',
+    title: isEdit ? t('contacts.editContact') : t('contacts.newContact'),
     content,
     size: 'md',
     onSave(panel) {
       panel.querySelector('#cm-cancel').addEventListener('click', closeModal);
 
       panel.querySelector('#cm-delete')?.addEventListener('click', async () => {
-        if (!confirm(`"${contact.name}" wirklich löschen?`)) return;
+        if (!confirm(t('contacts.deletePersonConfirm', { name: contact.name }))) return;
         closeModal();
         await deleteContact(contact.id);
       });
@@ -303,7 +317,7 @@ function openContactModal({ mode, contact = null }) {
         const address  = panel.querySelector('#cm-address').value.trim() || null;
         const notes    = panel.querySelector('#cm-notes').value.trim() || null;
 
-        if (!name) { window.oikos?.showToast('Name ist erforderlich', 'error'); return; }
+        if (!name) { window.oikos?.showToast(t('common.nameRequired'), 'error'); return; }
 
         saveBtn.disabled    = true;
         saveBtn.textContent = '…';
@@ -324,11 +338,11 @@ function openContactModal({ mode, contact = null }) {
           }
           closeModal();
           renderList();
-          window.oikos?.showToast(mode === 'create' ? 'Kontakt gespeichert' : 'Kontakt aktualisiert', 'success');
+          window.oikos?.showToast(mode === 'create' ? t('contacts.savedToast') : t('contacts.updatedToast'), 'success');
         } catch (err) {
-          window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+          window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
           saveBtn.disabled    = false;
-          saveBtn.textContent = isEdit ? 'Speichern' : 'Erstellen';
+          saveBtn.textContent = isEdit ? t('common.save') : t('common.create');
         }
       });
     },
@@ -336,15 +350,15 @@ function openContactModal({ mode, contact = null }) {
 }
 
 async function deleteContact(id) {
-  if (!confirm('Kontakt wirklich löschen?')) return;
+  if (!confirm(t('contacts.deleteConfirm'))) return;
   try {
     await api.delete(`/contacts/${id}`);
     state.contacts = state.contacts.filter((c) => c.id !== id);
     renderList();
     vibrate([30, 50, 30]);
-    window.oikos?.showToast('Kontakt gelöscht', 'success');
+    window.oikos?.showToast(t('contacts.deletedToast'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
   }
 }
 
diff --git a/public/pages/dashboard.js b/public/pages/dashboard.js
index ba0aaae..e43655a 100644
--- a/public/pages/dashboard.js
+++ b/public/pages/dashboard.js
@@ -5,6 +5,7 @@
  */
 
 import { api } from '/api.js';
+import { t, formatDate, formatTime, getLocale } from '/i18n.js';
 
 // Hält den AbortController des aktuellen FAB-Listeners — wird bei jedem render() erneuert.
 let _fabController = null;
@@ -15,14 +16,9 @@ let _fabController = null;
 
 function greeting(displayName) {
   const h = new Date().getHours();
-  const tageszeit = h < 12 ? 'Morgen' : h < 18 ? 'Tag' : 'Abend';
-  return `Guten ${tageszeit}, ${displayName}`;
-}
-
-function formatDate(date = new Date()) {
-  return date.toLocaleDateString('de-DE', {
-    weekday: 'long', year: 'numeric', month: 'long', day: 'numeric',
-  });
+  if (h < 12) return t('dashboard.greetingMorning', { name: displayName });
+  if (h < 18) return t('dashboard.greetingDay',     { name: displayName });
+  return t('dashboard.greetingEvening', { name: displayName });
 }
 
 function formatDateTime(isoString) {
@@ -33,13 +29,14 @@ function formatDateTime(isoString) {
   tomorrow.setDate(today.getDate() + 1);
 
   const dateStr = d.toDateString() === today.toDateString()
-    ? 'Heute'
+    ? t('common.today')
     : d.toDateString() === tomorrow.toDateString()
-    ? 'Morgen'
-    : d.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit' });
+    ? t('common.tomorrow')
+    : formatDate(d);
 
-  const timeStr = d.toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit' });
-  return `${dateStr}, ${timeStr} Uhr`;
+  const timeStr = formatTime(d);
+  const suffix = t('calendar.timeSuffix');
+  return `${dateStr}, ${timeStr}${suffix ? ' ' + suffix : ''}`.trim();
 }
 
 function formatDueDate(dateStr) {
@@ -49,21 +46,21 @@ function formatDueDate(dateStr) {
   const diffMs = due - now;
   const diffH = diffMs / (1000 * 60 * 60);
 
-  if (diffMs < 0) return { text: 'Überfällig', overdue: true };
-  if (diffH < 24) return { text: 'Heute fällig', overdue: false };
-  if (diffH < 48) return { text: 'Morgen fällig', overdue: false };
+  if (diffMs < 0) return { text: t('dashboard.overdue'),     overdue: true };
+  if (diffH < 24) return { text: t('dashboard.dueSoon'),    overdue: false };
+  if (diffH < 48) return { text: t('dashboard.dueTomorrow'), overdue: false };
   return {
-    text: due.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit' }),
+    text: formatDate(due),
     overdue: false,
   };
 }
 
-const MEAL_LABELS = {
-  breakfast: 'Frühstück',
-  lunch:     'Mittagessen',
-  dinner:    'Abendessen',
-  snack:     'Snack',
-};
+const MEAL_LABELS = () => ({
+  breakfast: t('meals.typeBreakfast'),
+  lunch:     t('meals.typeLunch'),
+  dinner:    t('meals.typeDinner'),
+  snack:     t('meals.typeSnack'),
+});
 
 const MEAL_ICONS = {
   breakfast: 'sunrise',
@@ -76,7 +73,8 @@ function initials(name = '') {
   return name.split(' ').map((w) => w[0]).join('').slice(0, 2).toUpperCase();
 }
 
-function widgetHeader(icon, title, count, linkHref, linkLabel = 'Alle') {
+function widgetHeader(icon, title, count, linkHref, linkLabel) {
+  linkLabel = linkLabel ?? t('dashboard.allLink');
   const badge = count != null
     ? `<span class="widget__badge">${count}</span>`
     : '';
@@ -122,24 +120,24 @@ function renderGreeting(user, stats = {}) {
   if (urgentCount > 0)
     statChips.push(`<span class="greeting-chip greeting-chip--warn">
       <i data-lucide="alert-circle" style="${chipIcon}" aria-hidden="true"></i>
-      ${urgentCount} dring. Aufgabe${urgentCount > 1 ? 'n' : ''}
+      ${urgentCount > 1 ? t('dashboard.urgentTasksChipPlural', { count: urgentCount }) : t('dashboard.urgentTasksChip', { count: urgentCount })}
     </span>`);
   if (todayEventCount > 0)
     statChips.push(`<span class="greeting-chip">
       <i data-lucide="calendar" style="${chipIcon}" aria-hidden="true"></i>
-      ${todayEventCount} Termin${todayEventCount > 1 ? 'e' : ''} heute
+      ${todayEventCount > 1 ? t('dashboard.eventsChipPlural', { count: todayEventCount }) : t('dashboard.eventsChip', { count: todayEventCount })}
     </span>`);
   if (todayMealTitle)
     statChips.push(`<span class="greeting-chip">
       <i data-lucide="utensils" style="${chipIcon}" aria-hidden="true"></i>
-      Heute: ${todayMealTitle}
+      ${t('dashboard.todayMealChip', { title: todayMealTitle })}
     </span>`);
 
   return `
     <div class="widget-greeting">
       <div class="widget-greeting__content">
         <div class="widget-greeting__title">${greeting(user.display_name)}</div>
-        <div class="widget-greeting__date">${formatDate()}</div>
+        <div class="widget-greeting__date">${formatDate(new Date())}</div>
         ${statChips.length ? `<div class="widget-greeting__chips">${statChips.join('')}</div>` : ''}
       </div>
     </div>
@@ -149,10 +147,10 @@ function renderGreeting(user, stats = {}) {
 function renderUrgentTasks(tasks) {
   if (!tasks.length) {
     return `<div class="widget">
-      ${widgetHeader('check-square', 'Aufgaben', 0, '/tasks')}
+      ${widgetHeader('check-square', t('nav.tasks'), 0, '/tasks')}
       <div class="widget__empty">
         <i data-lucide="check-circle" class="empty-state__icon" style="color:var(--color-success)" aria-hidden="true"></i>
-        <div>Alles erledigt</div>
+        <div>${t('dashboard.allDone')}</div>
       </div>
     </div>`;
   }
@@ -174,7 +172,7 @@ function renderUrgentTasks(tasks) {
   }).join('');
 
   return `<div class="widget">
-    ${widgetHeader('check-square', 'Aufgaben', tasks.length, '/tasks')}
+    ${widgetHeader('check-square', t('nav.tasks'), tasks.length, '/tasks')}
     <div class="widget__body">${items}</div>
   </div>`;
 }
@@ -182,10 +180,10 @@ function renderUrgentTasks(tasks) {
 function renderUpcomingEvents(events) {
   if (!events.length) {
     return `<div class="widget">
-      ${widgetHeader('calendar', 'Termine', 0, '/calendar')}
+      ${widgetHeader('calendar', t('nav.calendar'), 0, '/calendar')}
       <div class="widget__empty">
         <i data-lucide="calendar-check" class="empty-state__icon" aria-hidden="true"></i>
-        <div>Keine Termine</div>
+        <div>${t('dashboard.noEvents')}</div>
       </div>
     </div>`;
   }
@@ -194,14 +192,15 @@ function renderUpcomingEvents(events) {
   const items = events.map((e) => {
     const d = new Date(e.start_datetime);
     const isToday = d.toDateString() === today;
-    const timeStr = e.all_day ? 'Ganztägig' : d.toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit' }) + ' Uhr';
+    const _suffix = t('calendar.timeSuffix');
+    const timeStr = e.all_day ? t('dashboard.allDay') : `${formatTime(d)}${_suffix ? ' ' + _suffix : ''}`.trim();
     return `
       <div class="event-item" data-route="/calendar" role="button" tabindex="0">
         <div class="event-item__bar" style="background-color:${e.color || 'var(--color-accent)'}"></div>
         <div class="event-item__content">
           <div class="event-item__title">${e.title}</div>
           <div class="event-item__time">
-            <span class="event-time-badge ${isToday ? 'event-time-badge--today' : ''}">${isToday ? 'Heute' : formatDateTime(e.start_datetime).split(',')[0]}</span>
+            <span class="event-time-badge ${isToday ? 'event-time-badge--today' : ''}">${isToday ? t('common.today') : formatDateTime(e.start_datetime).split(',')[0]}</span>
             ${timeStr}
             ${e.location ? ` · ${e.location}` : ''}
           </div>
@@ -211,7 +210,7 @@ function renderUpcomingEvents(events) {
   }).join('');
 
   return `<div class="widget">
-    ${widgetHeader('calendar', 'Termine', events.length, '/calendar')}
+    ${widgetHeader('calendar', t('nav.calendar'), events.length, '/calendar')}
     <div class="widget__body">${items}</div>
   </div>`;
 }
@@ -219,19 +218,20 @@ function renderUpcomingEvents(events) {
 function renderTodayMeals(meals) {
   const MEAL_ORDER = ['breakfast', 'lunch', 'dinner', 'snack'];
 
+  const mealLabels = MEAL_LABELS();
   const slots = MEAL_ORDER.map((type) => {
     const meal = meals.find((m) => m.meal_type === type);
     return `
       <div class="meal-slot ${meal ? 'meal-slot--filled' : ''}" data-route="/meals" role="button" tabindex="0">
         <i data-lucide="${MEAL_ICONS[type]}" class="meal-slot__icon" aria-hidden="true"></i>
-        <div class="meal-slot__type">${MEAL_LABELS[type]}</div>
+        <div class="meal-slot__type">${mealLabels[type]}</div>
         <div class="meal-slot__title">${meal ? meal.title : '—'}</div>
       </div>
     `;
   }).join('');
 
   return `<div class="widget widget--meals">
-    ${widgetHeader('utensils', 'Heute essen', null, '/meals', 'Woche')}
+    ${widgetHeader('utensils', t('dashboard.todayMeals'), null, '/meals', t('dashboard.weekLink'))}
     <div class="meal-slots">${slots}</div>
   </div>`;
 }
@@ -239,10 +239,10 @@ function renderTodayMeals(meals) {
 function renderPinnedNotes(notes) {
   if (!notes.length) {
     return `<div class="widget">
-      ${widgetHeader('pin', 'Pinnwand', 0, '/notes')}
+      ${widgetHeader('pin', t('nav.notes'), 0, '/notes')}
       <div class="widget__empty">
         <i data-lucide="sticky-note" class="empty-state__icon" aria-hidden="true"></i>
-        <div>Keine angepinnten Notizen</div>
+        <div>${t('dashboard.noPinnedNotes')}</div>
       </div>
     </div>`;
   }
@@ -256,7 +256,7 @@ function renderPinnedNotes(notes) {
   `).join('');
 
   return `<div class="widget widget--wide">
-    ${widgetHeader('pin', 'Pinnwand', notes.length, '/notes')}
+    ${widgetHeader('pin', t('nav.notes'), notes.length, '/notes')}
     <div class="notes-grid-widget">${items}</div>
   </div>`;
 }
@@ -274,7 +274,7 @@ function renderWeatherWidget(weather) {
 
   const forecastHtml = forecast.map((d, i) => {
     const date = new Date(d.date + 'T12:00:00');
-    const label = date.toLocaleDateString('de-DE', { weekday: 'short' });
+    const label = new Intl.DateTimeFormat(getLocale(), { weekday: 'short' }).format(date);
     const extraCls = i >= 3 ? ' weather-forecast__day--extended' : '';
     return `
       <div class="weather-forecast__day${extraCls}">
@@ -290,7 +290,7 @@ function renderWeatherWidget(weather) {
 
   return `
     <div class="widget weather-widget" id="weather-widget">
-      <button class="weather-widget__refresh" id="weather-refresh-btn" aria-label="Wetter aktualisieren" title="Aktualisieren">
+      <button class="weather-widget__refresh" id="weather-refresh-btn" aria-label="${t('dashboard.weatherRefresh')}" title="${t('dashboard.weatherRefreshTitle')}">
         <i data-lucide="refresh-cw" style="width:14px;height:14px;" aria-hidden="true"></i>
       </button>
       <div class="weather-widget__inner">
@@ -300,7 +300,7 @@ function renderWeatherWidget(weather) {
             <div class="weather-widget__desc">${current.desc}</div>
             <div class="weather-widget__city">${city}</div>
             <div class="weather-widget__meta">
-              Gefühlt ${current.feels_like}° · ${current.humidity}% · Wind ${current.wind_speed} km/h
+              ${t('dashboard.weatherFeelsLike', { temp: current.feels_like, humidity: current.humidity, wind: current.wind_speed })}
             </div>
           </div>
           <img class="weather-widget__icon" src="${WEATHER_ICON_BASE}${current.icon}@2x.png"
@@ -315,17 +315,17 @@ function renderWeatherWidget(weather) {
 // FAB Speed-Dial
 // --------------------------------------------------------
 
-const FAB_ACTIONS = [
-  { route: '/tasks',    label: 'Aufgabe',  icon: 'check-square'   },
-  { route: '/calendar', label: 'Termin',   icon: 'calendar-plus'  },
-  { route: '/shopping', label: 'Einkauf',  icon: 'shopping-cart'  },
-  { route: '/notes',    label: 'Notiz',    icon: 'sticky-note'    },
+const FAB_ACTIONS = () => [
+  { route: '/tasks',    label: t('dashboard.fabTask'),     icon: 'check-square'   },
+  { route: '/calendar', label: t('dashboard.fabCalendar'), icon: 'calendar-plus'  },
+  { route: '/shopping', label: t('dashboard.fabShopping'), icon: 'shopping-cart'  },
+  { route: '/notes',    label: t('dashboard.fabNote'),     icon: 'sticky-note'    },
 ];
 
 function renderFab() {
-  const actionsHtml = FAB_ACTIONS.map((a) => `
+  const actionsHtml = FAB_ACTIONS().map((a) => `
     <div class="fab-action" data-route="${a.route}" role="button" tabindex="-1"
-         aria-label="${a.label} hinzufügen">
+         aria-label="${a.label}">
       <span class="fab-action__label">${a.label}</span>
       <button class="fab-action__btn" tabindex="-1" aria-hidden="true">
         <i data-lucide="${a.icon}" aria-hidden="true"></i>
@@ -335,7 +335,7 @@ function renderFab() {
 
   return `
     <div class="fab-container" id="fab-container">
-      <button class="fab-main" id="fab-main" aria-label="Schnellaktionen" aria-expanded="false">
+      <button class="fab-main" id="fab-main" aria-label="${t('nav.quickActions')}" aria-expanded="false">
         <i data-lucide="plus" aria-hidden="true"></i>
       </button>
       <div class="fab-actions" id="fab-actions" aria-hidden="true">
@@ -410,7 +410,7 @@ export async function render(container, { user }) {
         <div class="widget-greeting" style="grid-column:1/-1">
           <div class="widget-greeting__content">
             <div class="widget-greeting__title">${greeting(user.display_name)}</div>
-            <div class="widget-greeting__date">${formatDate()}</div>
+            <div class="widget-greeting__date">${formatDate(new Date())}</div>
           </div>
         </div>
         ${skeletonWidget(3)}
@@ -433,7 +433,7 @@ export async function render(container, { user }) {
     weather = weatherRes.data ?? null;
   } catch (err) {
     console.error('[Dashboard] Ladefehler:', err.message);
-    window.oikos?.showToast('Dashboard konnte nicht vollständig geladen werden.', 'warning');
+    window.oikos?.showToast(t('dashboard.loadError'), 'warning');
   }
 
   const today = new Date().toDateString();
@@ -449,7 +449,7 @@ export async function render(container, { user }) {
 
   container.innerHTML = `
     <div class="dashboard">
-      <h1 class="sr-only">Übersicht</h1>
+      <h1 class="sr-only">${t('dashboard.title')}</h1>
       <div class="dashboard__grid">
         ${renderGreeting(user, stats)}
         ${renderWeatherWidget(weather)}
diff --git a/public/pages/login.js b/public/pages/login.js
index 330e311..f2bd2f0 100644
--- a/public/pages/login.js
+++ b/public/pages/login.js
@@ -5,6 +5,7 @@
  */
 
 import { auth } from '/api.js';
+import { t } from '/i18n.js';
 
 /**
  * Rendert die Login-Seite in den gegebenen Container.
@@ -15,13 +16,13 @@ export async function render(container) {
     <main class="login-page" id="main-content">
       <div class="login-hero">
         <h1 class="login-hero__title">Oikos</h1>
-        <p class="login-hero__tagline">Familienplanung. Sicher. Datenschutzfreundlich. Open Source.</p>
+        <p class="login-hero__tagline">${t('login.tagline')}</p>
       </div>
       <div class="login-card card card--padded">
 
         <form class="login-form" id="login-form" novalidate>
           <div class="form-group">
-            <label class="label" for="username">Benutzername</label>
+            <label class="label" for="username">${t('login.usernameLabel')}</label>
             <input
               class="input"
               type="text"
@@ -30,20 +31,20 @@ export async function render(container) {
               autocomplete="username"
               autocapitalize="none"
               autocorrect="off"
-              placeholder="benutzername"
+              placeholder="${t('login.usernamePlaceholder')}"
               required
             />
           </div>
 
           <div class="form-group">
-            <label class="label" for="password">Passwort</label>
+            <label class="label" for="password">${t('login.passwordLabel')}</label>
             <input
               class="input"
               type="password"
               id="password"
               name="password"
               autocomplete="current-password"
-              placeholder="••••••••"
+              placeholder="${t('login.passwordPlaceholder')}"
               required
             />
           </div>
@@ -51,7 +52,7 @@ export async function render(container) {
           <div class="login-error" id="login-error" role="alert" aria-live="polite" hidden></div>
 
           <button type="submit" class="btn btn--primary login-form__submit" id="login-btn">
-            Anmelden
+            ${t('login.loginButton')}
           </button>
         </form>
       </div>
@@ -70,24 +71,24 @@ export async function render(container) {
     const password = form.password.value;
 
     if (!username || !password) {
-      showError(errorEl, 'Bitte alle Felder ausfüllen.');
+      showError(errorEl, t('common.allFieldsRequired'));
       return;
     }
 
     submitBtn.disabled = true;
-    submitBtn.textContent = 'Wird angemeldet …';
+    submitBtn.textContent = t('login.loggingIn');
 
     try {
       const result = await auth.login(username, password);
       window.oikos.navigate('/', result.user);
     } catch (err) {
       showError(errorEl, err.status === 429
-        ? 'Zu viele Versuche. Bitte warte kurz.'
-        : 'Ungültige Anmeldedaten.'
+        ? t('login.tooManyAttempts')
+        : t('login.invalidCredentials')
       );
     } finally {
       submitBtn.disabled = false;
-      submitBtn.textContent = 'Anmelden';
+      submitBtn.textContent = t('login.loginButton');
     }
   });
 }
diff --git a/public/pages/meals.js b/public/pages/meals.js
index d66cdf7..54e9883 100644
--- a/public/pages/meals.js
+++ b/public/pages/meals.js
@@ -7,19 +7,23 @@
 import { api } from '/api.js';
 import { openModal as openSharedModal, closeModal as closeSharedModal } from '/components/modal.js';
 import { stagger } from '/utils/ux.js';
+import { t, formatDate } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
 // --------------------------------------------------------
 
-const MEAL_TYPES = [
-  { key: 'breakfast', label: 'Frühstück',   icon: 'sunrise'       },
-  { key: 'lunch',     label: 'Mittagessen', icon: 'sun'           },
-  { key: 'dinner',    label: 'Abendessen',  icon: 'moon'          },
-  { key: 'snack',     label: 'Snack',       icon: 'cookie'        },
+const MEAL_TYPES = () => [
+  { key: 'breakfast', label: t('meals.typeBreakfast'), icon: 'sunrise' },
+  { key: 'lunch',     label: t('meals.typeLunch'),     icon: 'sun'     },
+  { key: 'dinner',    label: t('meals.typeDinner'),    icon: 'moon'    },
+  { key: 'snack',     label: t('meals.typeSnack'),     icon: 'cookie'  },
 ];
 
-const DAY_NAMES = ['Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa', 'So'];
+const DAY_NAMES = () => [
+  t('meals.dayMo'), t('meals.dayDi'), t('meals.dayMi'), t('meals.dayDo'),
+  t('meals.dayFr'), t('meals.daySa'), t('meals.daySo'),
+];
 
 // --------------------------------------------------------
 // State
@@ -55,11 +59,7 @@ function addDays(dateStr, n) {
 
 function formatWeekLabel(monday) {
   const sunday = addDays(monday, 6);
-  const fmt    = (s) => {
-    const d = new Date(s + 'T00:00:00Z');
-    return `${d.getUTCDate().toString().padStart(2, '0')}.${(d.getUTCMonth() + 1).toString().padStart(2, '0')}.${d.getUTCFullYear()}`;
-  };
-  return `${fmt(monday)} – ${fmt(sunday)}`;
+  return `${formatDate(monday)} – ${formatDate(sunday)}`;
 }
 
 function isToday(dateStr) {
@@ -67,8 +67,7 @@ function isToday(dateStr) {
 }
 
 function formatDayDate(dateStr) {
-  const d = new Date(dateStr + 'T00:00:00Z');
-  return `${d.getUTCDate()}.${d.getUTCMonth() + 1}.`;
+  return formatDate(dateStr);
 }
 
 // --------------------------------------------------------
@@ -84,7 +83,7 @@ async function loadWeek(week) {
     console.error('[Meals] loadWeek Fehler:', err);
     state.meals       = [];
     state.currentWeek = getMondayOf(week);
-    window.oikos?.showToast('Essensplan konnte nicht geladen werden.', 'danger');
+    window.oikos?.showToast(t('meals.loadError'), 'danger');
   }
 }
 
@@ -105,19 +104,19 @@ export async function render(container, { user }) {
   _container = container;
   container.innerHTML = `
     <div class="meals-page">
-      <h1 class="sr-only">Essensplan</h1>
+      <h1 class="sr-only">${t('meals.title')}</h1>
       <div class="week-nav">
-        <button class="btn btn--icon" id="week-prev" aria-label="Vorherige Woche">
+        <button class="btn btn--icon" id="week-prev" aria-label="${t('meals.prevWeek')}">
           <i data-lucide="chevron-left" aria-hidden="true"></i>
         </button>
         <span class="week-nav__label" id="week-label"></span>
-        <button class="week-nav__today" id="week-today">Heute</button>
-        <button class="btn btn--icon" id="week-next" aria-label="Nächste Woche">
+        <button class="week-nav__today" id="week-today">${t('meals.today')}</button>
+        <button class="btn btn--icon" id="week-next" aria-label="${t('meals.nextWeek')}">
           <i data-lucide="chevron-right" aria-hidden="true"></i>
         </button>
       </div>
       <div class="week-grid" id="week-grid">
-        <div style="margin:auto;padding:2rem;text-align:center;color:var(--color-text-disabled)">Lade…</div>
+        <div style="margin:auto;padding:2rem;text-align:center;color:var(--color-text-disabled)">${t('meals.loadingIndicator')}</div>
       </div>
     </div>
   `;
@@ -144,6 +143,7 @@ function renderWeekGrid() {
     formatWeekLabel(state.currentWeek);
 
   const days = Array.from({ length: 7 }, (_, i) => addDays(state.currentWeek, i));
+  const dayNames = DAY_NAMES();
 
   grid.innerHTML = days.map((date, idx) => {
     const mealsForDay = state.meals.filter((m) => m.date === date);
@@ -152,11 +152,11 @@ function renderWeekGrid() {
     return `
       <div class="day-column">
         <div class="day-header ${todayClass}">
-          <span class="day-header__name">${DAY_NAMES[idx]}</span>
+          <span class="day-header__name">${dayNames[idx]}</span>
           <span class="day-header__date">${formatDayDate(date)}</span>
         </div>
         <div class="day-slots">
-          ${MEAL_TYPES.map((type) => renderSlot(date, type, mealsForDay)).join('')}
+          ${MEAL_TYPES().map((type) => renderSlot(date, type, mealsForDay)).join('')}
         </div>
       </div>
     `;
@@ -175,14 +175,14 @@ function renderSlot(date, type, mealsForDay) {
       <div class="meal-slot meal-slot--empty" data-date="${date}" data-type="${type.key}">
         <div class="meal-slot__type-label">${type.label}</div>
         <div class="empty-state empty-state--compact">
-          <div class="empty-state__description">Kein Essen geplant</div>
+          <div class="empty-state__description">${t('meals.noMealPlanned')}</div>
         </div>
         <button
           class="meal-slot__add-btn"
           data-action="add-meal"
           data-date="${date}"
           data-type="${type.key}"
-          aria-label="${type.label} hinzufügen"
+          aria-label="${t('meals.addMeal', { type: type.label })}"
         >
           <i data-lucide="plus" style="width:16px;height:16px;" aria-hidden="true"></i>
         </button>
@@ -192,7 +192,7 @@ function renderSlot(date, type, mealsForDay) {
 
   const ingCount = meal.ingredients?.length ?? 0;
   const ingDone  = meal.ingredients?.filter((i) => i.on_shopping_list).length ?? 0;
-  const ingLabel = ingCount > 0 ? `${ingCount} Zutat${ingCount !== 1 ? 'en' : ''}` : '';
+  const ingLabel = ingCount > 0 ? (ingCount !== 1 ? t('meals.ingredientCountPlural', { count: ingCount }) : t('meals.ingredientCount', { count: ingCount })) : '';
   const ingDoneLabel = ingCount > 0 && ingDone === ingCount ? ' ✓' : '';
   const canTransfer  = ingCount > 0 && ingDone < ingCount;
 
@@ -211,12 +211,12 @@ function renderSlot(date, type, mealsForDay) {
           ${canTransfer ? `<button class="meal-card__action-btn meal-card__action-btn--shopping"
             data-action="transfer-meal"
             data-meal-id="${meal.id}"
-            aria-label="Zutaten auf Einkaufsliste"
+            aria-label="${t('meals.transferToShoppingList')}"
           ><i data-lucide="shopping-cart" style="width:14px;height:14px;" aria-hidden="true"></i></button>` : ''}
           <button class="meal-card__action-btn"
             data-action="delete-meal"
             data-meal-id="${meal.id}"
-            aria-label="Mahlzeit löschen"
+            aria-label="${t('meals.deleteMeal')}"
           ><i data-lucide="trash-2" style="width:14px;height:14px;" aria-hidden="true"></i></button>
         </div>
       </div>
@@ -429,7 +429,7 @@ function openMealModal(opts) {
   const content = buildModalContent(opts);
 
   openSharedModal({
-    title: isEdit ? 'Mahlzeit bearbeiten' : 'Mahlzeit hinzufügen',
+    title: isEdit ? t('meals.editMeal') : t('meals.addMealTitle'),
     content,
     size: 'md',
     onSave(panel) {
@@ -498,16 +498,16 @@ function openMealModal(opts) {
         try {
           const res = await api.post(`/meals/${state.modal.meal.id}/to-shopping-list`, { listId });
           if (res.data.transferred > 0) {
-            window.oikos?.showToast(`${res.data.transferred} Zutat${res.data.transferred !== 1 ? 'en' : ''} übertragen`, 'success');
+            window.oikos?.showToast(res.data.transferred !== 1 ? t('meals.transferSuccessPlural', { count: res.data.transferred }) : t('meals.transferSuccess', { count: res.data.transferred }), 'success');
             await loadWeek(state.currentWeek);
             closeModal();
             renderWeekGrid();
           } else {
-            window.oikos?.showToast('Alle Zutaten bereits übertragen', 'info');
+            window.oikos?.showToast(t('meals.transferAlreadyDone'), 'info');
             btn.disabled = false;
           }
         } catch (err) {
-          window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+          window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
           btn.disabled = false;
         }
       });
@@ -520,13 +520,13 @@ function openMealModal(opts) {
 
 function buildModalContent({ mode, date, mealType, meal }) {
   const isEdit   = mode === 'edit';
-  const typeOpts = MEAL_TYPES.map((t) =>
-    `<option value="${t.key}" ${t.key === mealType ? 'selected' : ''}>${t.label}</option>`
+  const typeOpts = MEAL_TYPES().map((mt) =>
+    `<option value="${mt.key}" ${mt.key === mealType ? 'selected' : ''}>${mt.label}</option>`
   ).join('');
 
   const listOpts = state.lists.length
     ? state.lists.map((l) => `<option value="${l.id}">${escHtml(l.name)}</option>`).join('')
-    : '<option value="" disabled>Keine Einkaufslisten vorhanden</option>';
+    : `<option value="" disabled>${t('meals.noShoppingLists')}</option>`;
 
   const ingRows = isEdit && meal.ingredients?.length
     ? meal.ingredients.map((ing) => ingredientRowHTML(ing.name, ing.quantity ?? '', ing.id)).join('')
@@ -537,36 +537,36 @@ function buildModalContent({ mode, date, mealType, meal }) {
   return `
     <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)">
       <div class="form-group" style="margin-bottom:0">
-        <label class="form-label" for="modal-date">Datum</label>
+        <label class="form-label" for="modal-date">${t('meals.dateLabel')}</label>
         <input type="date" class="form-input" id="modal-date" value="${date}">
       </div>
       <div class="form-group" style="margin-bottom:0">
-        <label class="form-label" for="modal-type">Mahlzeit</label>
+        <label class="form-label" for="modal-type">${t('meals.mealTypeLabel')}</label>
         <select class="form-input" id="modal-type">${typeOpts}</select>
       </div>
     </div>
 
     <div class="form-group" style="position:relative;">
-      <label class="form-label" for="modal-title">Titel *</label>
+      <label class="form-label" for="modal-title">${t('meals.titleLabel')}</label>
       <input type="text" class="form-input" id="modal-title"
-             placeholder="z.B. Spaghetti Bolognese"
+             placeholder="${t('meals.titlePlaceholder')}"
              value="${escHtml(isEdit ? meal.title : '')}"
              autocomplete="off">
       <div id="modal-autocomplete" class="meal-modal__autocomplete" hidden></div>
     </div>
 
     <div class="form-group">
-      <label class="form-label" for="modal-notes">Notizen</label>
+      <label class="form-label" for="modal-notes">${t('meals.notesLabel')}</label>
       <textarea class="form-input" id="modal-notes" rows="2"
-                placeholder="Optional…">${escHtml(isEdit && meal.notes ? meal.notes : '')}</textarea>
+                placeholder="${t('meals.notesPlaceholder')}">${escHtml(isEdit && meal.notes ? meal.notes : '')}</textarea>
     </div>
 
     <div class="form-group">
-      <label class="form-label">Zutaten</label>
+      <label class="form-label">${t('meals.ingredientsLabel')}</label>
       <div class="ingredient-list" id="ingredient-list">${ingRows}</div>
       <button class="add-ingredient-btn" id="add-ingredient-btn" type="button">
         <i data-lucide="plus" style="width:14px;height:14px;" aria-hidden="true"></i>
-        Zutat hinzufügen
+        ${t('meals.addIngredient')}
       </button>
     </div>
 
@@ -574,26 +574,26 @@ function buildModalContent({ mode, date, mealType, meal }) {
     <div class="shopping-transfer">
       <div class="shopping-transfer__label">
         <i data-lucide="shopping-cart" style="width:14px;height:14px;" aria-hidden="true"></i>
-        Zutaten auf Einkaufsliste übertragen
+        ${t('meals.transferLabel')}
       </div>
       <select class="shopping-transfer__select" id="transfer-list-select">${listOpts}</select>
       <button class="btn btn--secondary shopping-transfer__btn" id="transfer-btn" type="button">
-        Jetzt übertragen
+        ${t('meals.transferNow')}
       </button>
     </div>` : ''}
 
     <div class="modal-panel__footer" style="border:none;padding:0;margin-top:var(--space-4)">
-      <button class="btn btn--secondary" id="modal-cancel">Abbrechen</button>
-      <button class="btn btn--primary" id="modal-save">${isEdit ? 'Speichern' : 'Hinzufügen'}</button>
+      <button class="btn btn--secondary" id="modal-cancel">${t('common.cancel')}</button>
+      <button class="btn btn--primary" id="modal-save">${isEdit ? t('common.save') : t('common.add')}</button>
     </div>`;
 }
 
 function ingredientRowHTML(name, qty, id) {
   return `
     <div class="ingredient-row" data-ing-id="${id ?? ''}">
-      <input type="text" class="form-input ingredient-row__name" placeholder="Zutat" value="${escHtml(name)}">
-      <input type="text" class="form-input ingredient-row__qty" placeholder="Menge" value="${escHtml(qty)}">
-      <button class="ingredient-row__remove" data-action="remove-ingredient" type="button" aria-label="Zutat entfernen">
+      <input type="text" class="form-input ingredient-row__name" placeholder="${t('meals.ingredientNamePlaceholder')}" value="${escHtml(name)}">
+      <input type="text" class="form-input ingredient-row__qty" placeholder="${t('meals.ingredientQtyPlaceholder')}" value="${escHtml(qty)}">
+      <button class="ingredient-row__remove" data-action="remove-ingredient" type="button" aria-label="${t('meals.removeIngredient')}">
         <i data-lucide="x" style="width:14px;height:14px;" aria-hidden="true"></i>
       </button>
     </div>
@@ -613,7 +613,7 @@ async function saveModal(overlay) {
   const notes     = overlay.querySelector('#modal-notes').value.trim() || null;
 
   if (!title) {
-    window.oikos?.showToast('Titel ist erforderlich', 'error');
+    window.oikos?.showToast(t('meals.titleRequired'), 'error');
     return;
   }
 
@@ -656,11 +656,11 @@ async function saveModal(overlay) {
 
     closeModal();
     renderWeekGrid();
-    window.oikos?.showToast(mode === 'create' ? 'Mahlzeit hinzugefügt' : 'Mahlzeit gespeichert', 'success');
+    window.oikos?.showToast(mode === 'create' ? t('meals.addMealTitle') : t('meals.editMeal'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler beim Speichern', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.errorGeneric'), 'error');
     saveBtn.disabled    = false;
-    saveBtn.textContent = state.modal?.mode === 'edit' ? 'Speichern' : 'Hinzufügen';
+    saveBtn.textContent = state.modal?.mode === 'edit' ? t('common.save') : t('common.add');
   }
 }
 
@@ -669,14 +669,14 @@ async function saveModal(overlay) {
 // --------------------------------------------------------
 
 async function deleteMeal(mealId) {
-  if (!confirm('Mahlzeit wirklich löschen?')) return;
+  if (!confirm(t('meals.deleteMeal') + '?')) return;
   try {
     await api.delete(`/meals/${mealId}`);
     state.meals = state.meals.filter((m) => m.id !== mealId);
     renderWeekGrid();
-    window.oikos?.showToast('Mahlzeit gelöscht', 'success');
+    window.oikos?.showToast(t('meals.deleteMeal'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler beim Löschen', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.errorGeneric'), 'error');
   }
 }
 
@@ -686,7 +686,7 @@ async function deleteMeal(mealId) {
 
 async function transferMeal(mealId) {
   if (!state.lists.length) {
-    window.oikos?.showToast('Keine Einkaufslisten vorhanden', 'error');
+    window.oikos?.showToast(t('meals.noShoppingLists'), 'error');
     return;
   }
 
@@ -703,14 +703,14 @@ async function transferMeal(mealId) {
   try {
     const res = await api.post(`/meals/${mealId}/to-shopping-list`, { listId });
     if (res.data.transferred > 0) {
-      window.oikos?.showToast(`${res.data.transferred} Zutat${res.data.transferred !== 1 ? 'en' : ''} übertragen`, 'success');
+      window.oikos?.showToast(res.data.transferred !== 1 ? t('meals.transferSuccessPlural', { count: res.data.transferred }) : t('meals.transferSuccess', { count: res.data.transferred }), 'success');
       await loadWeek(state.currentWeek);
       renderWeekGrid();
     } else {
-      window.oikos?.showToast('Alle Zutaten bereits übertragen', 'info');
+      window.oikos?.showToast(t('meals.transferAlreadyDone'), 'info');
     }
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler beim Übertragen', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.errorGeneric'), 'error');
   }
 }
 
diff --git a/public/pages/notes.js b/public/pages/notes.js
index 009c52b..ecaf171 100644
--- a/public/pages/notes.js
+++ b/public/pages/notes.js
@@ -7,6 +7,7 @@
 import { api } from '/api.js';
 import { openModal as openSharedModal, closeModal, btnError } from '/components/modal.js';
 import { stagger, vibrate } from '/utils/ux.js';
+import { t } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
@@ -48,20 +49,20 @@ export async function render(container, { user }) {
   container.innerHTML = `
     <div class="notes-page">
       <div class="notes-toolbar">
-        <h1 class="notes-toolbar__title">Pinnwand</h1>
+        <h1 class="notes-toolbar__title">${t('notes.title')}</h1>
         <div class="notes-toolbar__search">
           <i data-lucide="search" class="notes-toolbar__search-icon" aria-hidden="true"></i>
           <input type="search" id="notes-search" class="notes-toolbar__search-input"
-                 placeholder="Notizen durchsuchen…" autocomplete="off"
+                 placeholder="${t('notes.searchPlaceholder')}" autocomplete="off"
                  value="${escHtml(state.filterQuery)}">
         </div>
         <button class="btn btn--primary" id="notes-add-btn">
           <i data-lucide="plus" style="width:16px;height:16px;margin-right:4px;" aria-hidden="true"></i>
-          Neue Notiz
+          ${t('notes.addNoteLabel')}
         </button>
       </div>
       <div id="notes-grid" class="notes-grid"></div>
-      <button class="page-fab" id="fab-new-note" aria-label="Neue Notiz">
+      <button class="page-fab" id="fab-new-note" aria-label="${t('notes.addNoteLabel')}">
         <i data-lucide="plus" style="width:24px;height:24px" aria-hidden="true"></i>
       </button>
     </div>
@@ -75,7 +76,7 @@ export async function render(container, { user }) {
   } catch (err) {
     console.error('[Notes] Laden fehlgeschlagen:', err);
     state.notes = [];
-    window.oikos?.showToast('Notizen konnten nicht geladen werden.', 'danger');
+    window.oikos?.showToast(t('notes.loadError'), 'danger');
   }
   const grid = container.querySelector('#notes-grid');
   grid.addEventListener('click', async (e) => {
@@ -131,8 +132,8 @@ function renderGrid() {
           <line x1="16" y1="17" x2="8" y2="17"/>
           <polyline points="10 9 9 9 8 9"/>
         </svg>
-        <div class="empty-state__title">${isFiltered ? 'Keine Treffer' : 'Noch keine Notizen'}</div>
-        <div class="empty-state__description">${isFiltered ? `Keine Notiz enthält „${escHtml(state.filterQuery)}".` : 'Neue Notiz über den + Button erstellen.'}</div>
+        <div class="empty-state__title">${isFiltered ? t('notes.noResultsTitle') : t('notes.emptyTitle')}</div>
+        <div class="empty-state__description">${isFiltered ? t('notes.noResultsDescription', { query: state.filterQuery }) : t('notes.emptyDescription')}</div>
       </div>
     `;
     if (window.lucide) lucide.createIcons();
@@ -156,7 +157,7 @@ function renderNoteCard(note) {
          data-id="${note.id}"
          style="background-color:${escHtml(note.color)};color:${textColor};">
       <button class="note-card__pin" data-action="pin" data-id="${note.id}"
-              aria-label="${note.pinned ? 'Anpinnen aufheben' : 'Anpinnen'}">
+              aria-label="${note.pinned ? t('notes.unpinAction') : t('notes.pinAction')}">
         <i data-lucide="${note.pinned ? 'pin-off' : 'pin'}" style="width:12px;height:12px;" aria-hidden="true"></i>
       </button>
       ${note.title ? `<div class="note-card__title">${escHtml(note.title)}</div>` : ''}
@@ -167,7 +168,7 @@ function renderNoteCard(note) {
                 style="background-color:${escHtml(note.creator_color || '#8E8E93')}">${initials}</span>
           <span>${escHtml(note.creator_name || '')}</span>
         </div>
-        <button class="note-card__delete" data-action="delete" data-id="${note.id}" aria-label="Notiz löschen">
+        <button class="note-card__delete" data-action="delete" data-id="${note.id}" aria-label="${t('notes.deleteLabel')}">
           <i data-lucide="trash-2" style="width:12px;height:12px;" aria-hidden="true"></i>
         </button>
       </div>
@@ -315,58 +316,58 @@ function openNoteModal({ mode, note = null }) {
 
   const content = `
     <div class="form-group">
-      <label class="form-label" for="note-title">Titel (optional)</label>
+      <label class="form-label" for="note-title">${t('notes.titleLabel')}</label>
       <input type="text" class="form-input" id="note-title"
-             placeholder="Kein Titel" value="${escHtml(isEdit && note.title ? note.title : '')}">
+             placeholder="${t('notes.titlePlaceholder')}" value="${escHtml(isEdit && note.title ? note.title : '')}">
     </div>
     <div class="form-group">
-      <label class="form-label" for="note-content">Inhalt <span style="font-weight:400;color:var(--text-tertiary);font-size:.85em;">(Markdown-Formatierung möglich)</span></label>
+      <label class="form-label" for="note-content">${t('notes.contentLabel')} <span style="font-weight:400;color:var(--text-tertiary);font-size:.85em;">${t('notes.contentMarkdownHint')}</span></label>
       <div class="note-format-toolbar">
-        <button type="button" class="note-format-btn" data-format="bold" title="Fett (Strg+B)">
+        <button type="button" class="note-format-btn" data-format="bold" title="${t('notes.formatBold')}">
           <i data-lucide="bold" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="italic" title="Kursiv (Strg+I)">
+        <button type="button" class="note-format-btn" data-format="italic" title="${t('notes.formatItalic')}">
           <i data-lucide="italic" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="underline" title="Unterstrichen (Strg+U)">
+        <button type="button" class="note-format-btn" data-format="underline" title="${t('notes.formatUnderline')}">
           <i data-lucide="underline" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="strikethrough" title="Durchgestrichen">
+        <button type="button" class="note-format-btn" data-format="strikethrough" title="${t('notes.formatStrikethrough')}">
           <i data-lucide="strikethrough" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
         <span class="note-format-btn--sep"></span>
-        <button type="button" class="note-format-btn" data-format="heading" title="Überschrift">
+        <button type="button" class="note-format-btn" data-format="heading" title="${t('notes.formatHeading')}">
           <i data-lucide="heading" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="list" title="Aufzählung">
+        <button type="button" class="note-format-btn" data-format="list" title="${t('notes.formatList')}">
           <i data-lucide="list" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="ordered-list" title="Nummerierte Liste">
+        <button type="button" class="note-format-btn" data-format="ordered-list" title="${t('notes.formatOrderedList')}">
           <i data-lucide="list-ordered" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="checklist" title="Checkliste">
+        <button type="button" class="note-format-btn" data-format="checklist" title="${t('notes.formatChecklist')}">
           <i data-lucide="list-checks" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
         <span class="note-format-btn--sep"></span>
-        <button type="button" class="note-format-btn" data-format="link" title="Link">
+        <button type="button" class="note-format-btn" data-format="link" title="${t('notes.formatLink')}">
           <i data-lucide="link" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="code" title="Code">
+        <button type="button" class="note-format-btn" data-format="code" title="${t('notes.formatCode')}">
           <i data-lucide="code" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="quote" title="Zitat">
+        <button type="button" class="note-format-btn" data-format="quote" title="${t('notes.formatQuote')}">
           <i data-lucide="quote" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
-        <button type="button" class="note-format-btn" data-format="divider" title="Trennlinie">
+        <button type="button" class="note-format-btn" data-format="divider" title="${t('notes.formatDivider')}">
           <i data-lucide="minus" style="width:14px;height:14px;" aria-hidden="true"></i>
         </button>
       </div>
       <textarea class="form-input" id="note-content" rows="6"
-                placeholder="Notiz eingeben…"
+                placeholder="${t('notes.contentPlaceholder')}"
                 style="resize:vertical;">${escHtml(isEdit ? note.content : '')}</textarea>
     </div>
     <div class="form-group">
-      <label class="form-label">Farbe</label>
+      <label class="form-label">${t('notes.colorLabel')}</label>
       <div class="note-color-picker">
         ${NOTE_COLORS.map((c) => `
           <div class="note-color-swatch ${c === selColor ? 'note-color-swatch--active' : ''}"
@@ -379,17 +380,17 @@ function openNoteModal({ mode, note = null }) {
     <div class="form-group">
       <label class="allday-toggle">
         <input type="checkbox" id="note-pinned" ${isEdit && note.pinned ? 'checked' : ''}>
-        <span class="allday-toggle__label">Anpinnen (erscheint auf Dashboard)</span>
+        <span class="allday-toggle__label">${t('notes.pinnedLabel')}</span>
       </label>
     </div>
 
     <div class="modal-panel__footer" style="border:none;padding:0;margin-top:var(--space-4)">
-      <button class="btn btn--secondary" id="note-modal-cancel">Abbrechen</button>
-      <button class="btn btn--primary" id="note-modal-save">${isEdit ? 'Speichern' : 'Erstellen'}</button>
+      <button class="btn btn--secondary" id="note-modal-cancel">${t('common.cancel')}</button>
+      <button class="btn btn--primary" id="note-modal-save">${isEdit ? t('common.save') : t('common.create')}</button>
     </div>`;
 
   openSharedModal({
-    title: isEdit ? 'Notiz bearbeiten' : 'Neue Notiz',
+    title: isEdit ? t('notes.editNote') : t('notes.newNote'),
     content,
     size: 'md',
     onSave(panel) {
@@ -427,7 +428,7 @@ function openNoteModal({ mode, note = null }) {
         const color   = panel.querySelector('.note-color-swatch--active')?.dataset.color || NOTE_COLORS[0];
         const pinned  = panel.querySelector('#note-pinned').checked ? 1 : 0;
 
-        if (!cnt) { window.oikos?.showToast('Inhalt ist erforderlich', 'error'); return; }
+        if (!cnt) { window.oikos?.showToast(t('common.contentRequired'), 'error'); return; }
 
         saveBtn.disabled    = true;
         saveBtn.textContent = '…';
@@ -444,12 +445,12 @@ function openNoteModal({ mode, note = null }) {
           }
           closeModal();
           renderGrid();
-          window.oikos?.showToast(mode === 'create' ? 'Notiz erstellt' : 'Notiz gespeichert', 'success');
+          window.oikos?.showToast(mode === 'create' ? t('notes.createdToast') : t('notes.savedToast'), 'success');
         } catch (err) {
-          window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+          window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
           btnError(saveBtn);
           saveBtn.disabled    = false;
-          saveBtn.textContent = isEdit ? 'Speichern' : 'Erstellen';
+          saveBtn.textContent = isEdit ? t('common.save') : t('common.create');
         }
       });
     },
@@ -468,20 +469,20 @@ async function togglePin(id) {
     state.notes.sort((a, b) => b.pinned - a.pinned);
     renderGrid();
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
   }
 }
 
 async function deleteNote(id) {
-  if (!confirm('Notiz wirklich löschen?')) return;
+  if (!confirm(t('notes.deleteConfirm'))) return;
   try {
     await api.delete(`/notes/${id}`);
     state.notes = state.notes.filter((n) => n.id !== id);
     renderGrid();
     vibrate([30, 50, 30]);
-    window.oikos?.showToast('Notiz gelöscht', 'success');
+    window.oikos?.showToast(t('notes.deletedToast'), 'success');
   } catch (err) {
-    window.oikos?.showToast(err.data?.error ?? 'Fehler', 'error');
+    window.oikos?.showToast(err.data?.error ?? t('common.unknownError'), 'error');
   }
 }
 
diff --git a/public/pages/settings.js b/public/pages/settings.js
index 29c5f4d..e47f380 100644
--- a/public/pages/settings.js
+++ b/public/pages/settings.js
@@ -5,6 +5,8 @@
  */
 
 import { api, auth } from '/api.js';
+import { t, formatDate, formatTime } from '/i18n.js';
+import '/components/oikos-locale-picker.js';
 
 /**
  * @param {HTMLElement} container
@@ -32,40 +34,58 @@ export async function render(container, { user }) {
     if (aStatus.status  === 'fulfilled')  appleStatus  = aStatus.value;
   } catch (_) { /* non-critical */ }
 
+  const googleStatusText = googleStatus.connected
+    ? (googleStatus.lastSync ? t('settings.connectedLastSync', { date: formatDateTime(googleStatus.lastSync) }) : t('settings.connected'))
+    : googleStatus.configured ? t('settings.notConnected') : t('settings.notConfigured');
+
+  const appleStatusText = appleStatus.connected
+    ? (appleStatus.lastSync ? t('settings.connectedLastSync', { date: formatDateTime(appleStatus.lastSync) }) : t('settings.connected'))
+    : appleStatus.configured
+      ? (appleStatus.lastSync ? t('settings.configuredLastSync', { date: formatDateTime(appleStatus.lastSync) }) : t('settings.configured'))
+      : t('settings.notConnected');
+
   container.innerHTML = `
     <div class="page settings-page">
       <div class="page__header">
-        <h1 class="page__title">Einstellungen</h1>
+        <h1 class="page__title">${t('settings.title')}</h1>
       </div>
 
-      ${syncOk  ? `<div class="settings-banner settings-banner--success">Kalender-Sync mit ${syncOk === 'google' ? 'Google' : 'Apple'} erfolgreich verbunden.</div>` : ''}
-      ${syncErr ? `<div class="settings-banner settings-banner--error">Verbindung mit ${syncErr === 'google' ? 'Google' : 'Apple'} fehlgeschlagen. Bitte erneut versuchen.</div>` : ''}
+      ${syncOk  ? `<div class="settings-banner settings-banner--success">${syncOk === 'google' ? t('settings.syncSuccessGoogle') : t('settings.syncSuccessApple')}</div>` : ''}
+      ${syncErr ? `<div class="settings-banner settings-banner--error">${syncErr === 'google' ? t('settings.syncErrorGoogle') : t('settings.syncErrorApple')}</div>` : ''}
 
       <!-- Design -->
       <section class="settings-section">
-        <h2 class="settings-section__title">Design</h2>
+        <h2 class="settings-section__title">${t('settings.sectionDesign')}</h2>
         <div class="settings-card">
-          <h3 class="settings-card__title">Darstellung</h3>
+          <h3 class="settings-card__title">${t('settings.cardAppearance')}</h3>
           <div class="theme-toggle" id="theme-toggle">
-            <button class="theme-toggle__btn ${currentTheme() === 'system' ? 'theme-toggle__btn--active' : ''}" data-theme-value="system" aria-label="System-Einstellung verwenden">
+            <button class="theme-toggle__btn ${currentTheme() === 'system' ? 'theme-toggle__btn--active' : ''}" data-theme-value="system" aria-label="${t('settings.themeSysLabel')}">
               <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="2" y="3" width="20" height="14" rx="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>
-              System
+              ${t('settings.themeSystem')}
             </button>
-            <button class="theme-toggle__btn ${currentTheme() === 'light' ? 'theme-toggle__btn--active' : ''}" data-theme-value="light" aria-label="Helles Design">
+            <button class="theme-toggle__btn ${currentTheme() === 'light' ? 'theme-toggle__btn--active' : ''}" data-theme-value="light" aria-label="${t('settings.themeLightLabel')}">
               <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg>
-              Hell
+              ${t('settings.themeLight')}
             </button>
-            <button class="theme-toggle__btn ${currentTheme() === 'dark' ? 'theme-toggle__btn--active' : ''}" data-theme-value="dark" aria-label="Dunkles Design">
+            <button class="theme-toggle__btn ${currentTheme() === 'dark' ? 'theme-toggle__btn--active' : ''}" data-theme-value="dark" aria-label="${t('settings.themeDarkLabel')}">
               <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/></svg>
-              Dunkel
+              ${t('settings.themeDark')}
             </button>
           </div>
         </div>
       </section>
 
+      <!-- Sprache -->
+      <section class="settings-section">
+        <h2 class="settings-section__title">${t('settings.languageTitle')}</h2>
+        <div class="settings-card">
+          <oikos-locale-picker></oikos-locale-picker>
+        </div>
+      </section>
+
       <!-- Mein Konto -->
       <section class="settings-section">
-        <h2 class="settings-section__title">Mein Konto</h2>
+        <h2 class="settings-section__title">${t('settings.sectionAccount')}</h2>
 
         <div class="settings-card">
           <div class="settings-user-info">
@@ -80,29 +100,29 @@ export async function render(container, { user }) {
         </div>
 
         <div class="settings-card">
-          <h3 class="settings-card__title">Passwort ändern</h3>
+          <h3 class="settings-card__title">${t('settings.changePassword')}</h3>
           <form id="password-form" class="settings-form">
             <div class="form-group">
-              <label class="form-label" for="current-password">Aktuelles Passwort</label>
+              <label class="form-label" for="current-password">${t('settings.currentPasswordLabel')}</label>
               <input class="form-input" type="password" id="current-password" autocomplete="current-password" required />
             </div>
             <div class="form-group">
-              <label class="form-label" for="new-password">Neues Passwort</label>
+              <label class="form-label" for="new-password">${t('settings.newPasswordLabel')}</label>
               <input class="form-input" type="password" id="new-password" autocomplete="new-password" minlength="8" required />
             </div>
             <div class="form-group">
-              <label class="form-label" for="confirm-password">Neues Passwort bestätigen</label>
+              <label class="form-label" for="confirm-password">${t('settings.confirmPasswordLabel')}</label>
               <input class="form-input" type="password" id="confirm-password" autocomplete="new-password" minlength="8" required />
             </div>
             <div id="password-error" class="form-error" hidden></div>
-            <button type="submit" class="btn btn--primary">Passwort speichern</button>
+            <button type="submit" class="btn btn--primary">${t('settings.savePassword')}</button>
           </form>
         </div>
       </section>
 
       <!-- Kalender-Synchronisation -->
       <section class="settings-section">
-        <h2 class="settings-section__title">Kalender-Synchronisation</h2>
+        <h2 class="settings-section__title">${t('settings.sectionCalendarSync')}</h2>
 
         <!-- Google Calendar -->
         <div class="settings-card">
@@ -116,21 +136,19 @@ export async function render(container, { user }) {
               </svg>
             </div>
             <div class="settings-sync-info">
-              <div class="settings-sync-info__name">Google Calendar</div>
+              <div class="settings-sync-info__name">${t('settings.googleCalendar')}</div>
               <div class="settings-sync-info__status ${googleStatus.connected ? 'settings-sync-info__status--connected' : ''}">
-                ${googleStatus.connected
-                  ? `Verbunden${googleStatus.lastSync ? ` · Zuletzt: ${formatDate(googleStatus.lastSync)}` : ''}`
-                  : googleStatus.configured ? 'Nicht verbunden' : 'Nicht konfiguriert (fehlende .env-Variablen)'}
+                ${googleStatusText}
               </div>
             </div>
           </div>
           ${googleStatus.configured ? `
             <div class="settings-sync-actions">
               ${googleStatus.connected ? `
-                <button class="btn btn--secondary" id="google-sync-btn">Jetzt synchronisieren</button>
-                ${user?.role === 'admin' ? `<button class="btn btn--danger-outline" id="google-disconnect-btn">Verbindung trennen</button>` : ''}
+                <button class="btn btn--secondary" id="google-sync-btn">${t('settings.syncNow')}</button>
+                ${user?.role === 'admin' ? `<button class="btn btn--danger-outline" id="google-disconnect-btn">${t('settings.disconnect')}</button>` : ''}
               ` : `
-                ${user?.role === 'admin' ? `<a href="/api/v1/calendar/google/auth" class="btn btn--primary">Mit Google verbinden</a>` : '<span class="form-hint">Nur Admin kann Google Calendar verbinden.</span>'}
+                ${user?.role === 'admin' ? `<a href="/api/v1/calendar/google/auth" class="btn btn--primary">${t('settings.connectGoogle')}</a>` : `<span class="form-hint">${t('settings.googleOnlyAdmin')}</span>`}
               `}
             </div>
           ` : ''}
@@ -145,84 +163,80 @@ export async function render(container, { user }) {
               </svg>
             </div>
             <div class="settings-sync-info">
-              <div class="settings-sync-info__name">Apple Calendar (iCloud)</div>
+              <div class="settings-sync-info__name">${t('settings.appleCalendar')}</div>
               <div class="settings-sync-info__status ${appleStatus.configured ? 'settings-sync-info__status--connected' : ''}">
-                ${appleStatus.connected
-                  ? `Verbunden${appleStatus.lastSync ? ` · Zuletzt: ${formatDate(appleStatus.lastSync)}` : ''}`
-                  : appleStatus.configured
-                    ? `Konfiguriert (via .env)${appleStatus.lastSync ? ` · Zuletzt: ${formatDate(appleStatus.lastSync)}` : ''}`
-                    : 'Nicht verbunden'}
+                ${appleStatusText}
               </div>
             </div>
           </div>
           ${appleStatus.configured ? `
             <div class="settings-sync-actions">
-              <button class="btn btn--secondary" id="apple-sync-btn">Jetzt synchronisieren</button>
-              ${appleStatus.connected && user?.role === 'admin' ? `<button class="btn btn--danger-outline" id="apple-disconnect-btn">Verbindung trennen</button>` : ''}
+              <button class="btn btn--secondary" id="apple-sync-btn">${t('settings.syncNow')}</button>
+              ${appleStatus.connected && user?.role === 'admin' ? `<button class="btn btn--danger-outline" id="apple-disconnect-btn">${t('settings.disconnect')}</button>` : ''}
             </div>
           ` : user?.role === 'admin' ? `
             <form id="apple-connect-form" class="settings-form settings-form--compact">
               <div class="form-group">
-                <label class="form-label" for="apple-caldav-url">CalDAV-Server-URL</label>
-                <input class="form-input" type="url" id="apple-caldav-url" placeholder="https://caldav.icloud.com" required />
+                <label class="form-label" for="apple-caldav-url">${t('settings.caldavUrlLabel')}</label>
+                <input class="form-input" type="url" id="apple-caldav-url" placeholder="${t('settings.caldavUrlPlaceholder')}" required />
               </div>
               <div class="form-group">
-                <label class="form-label" for="apple-username">Apple-ID (E-Mail)</label>
+                <label class="form-label" for="apple-username">${t('settings.appleIdLabel')}</label>
                 <input class="form-input" type="email" id="apple-username" autocomplete="username" required />
               </div>
               <div class="form-group">
-                <label class="form-label" for="apple-password">App-spezifisches Passwort</label>
+                <label class="form-label" for="apple-password">${t('settings.applePasswordLabel')}</label>
                 <input class="form-input" type="password" id="apple-password" autocomplete="current-password" required />
-                <span class="form-hint">Passwort unter <strong>appleid.apple.com → Sicherheit</strong> erstellen.</span>
+                <span class="form-hint">${t('settings.applePasswordHint')}</span>
               </div>
               <div id="apple-connect-error" class="form-error" hidden></div>
-              <button type="submit" class="btn btn--primary" id="apple-connect-btn">Verbinden &amp; testen</button>
+              <button type="submit" class="btn btn--primary" id="apple-connect-btn">${t('settings.appleConnectBtn')}</button>
             </form>
-          ` : '<span class="form-hint">Nur Admin kann Apple Calendar verbinden.</span>'}
+          ` : `<span class="form-hint">${t('settings.appleOnlyAdmin')}</span>`}
         </div>
       </section>
 
       <!-- Familienmitglieder (nur Admin) -->
       ${user?.role === 'admin' ? `
       <section class="settings-section">
-        <h2 class="settings-section__title">Familienmitglieder</h2>
+        <h2 class="settings-section__title">${t('settings.sectionFamily')}</h2>
         <div class="settings-card" id="members-card">
           <ul class="settings-members" id="members-list">
             ${users.map(memberHtml).join('')}
           </ul>
-          <button class="btn btn--primary settings-add-btn" id="add-member-btn">+ Mitglied hinzufügen</button>
+          <button class="btn btn--primary settings-add-btn" id="add-member-btn">${t('settings.addMember')}</button>
         </div>
 
         <div class="settings-card settings-card--hidden" id="add-member-form-card">
-          <h3 class="settings-card__title">Neues Familienmitglied</h3>
+          <h3 class="settings-card__title">${t('settings.newMemberTitle')}</h3>
           <form id="add-member-form" class="settings-form">
             <div class="form-group">
-              <label class="form-label" for="new-username">Benutzername</label>
+              <label class="form-label" for="new-username">${t('settings.usernameLabel')}</label>
               <input class="form-input" type="text" id="new-username" required autocomplete="off" />
             </div>
             <div class="form-group">
-              <label class="form-label" for="new-display-name">Anzeigename</label>
+              <label class="form-label" for="new-display-name">${t('settings.displayNameLabel')}</label>
               <input class="form-input" type="text" id="new-display-name" required />
             </div>
             <div class="form-group">
-              <label class="form-label" for="new-member-password">Passwort</label>
+              <label class="form-label" for="new-member-password">${t('settings.memberPasswordLabel')}</label>
               <input class="form-input" type="password" id="new-member-password" minlength="8" required autocomplete="new-password" />
             </div>
             <div class="form-group">
-              <label class="form-label" for="new-avatar-color">Farbe</label>
+              <label class="form-label" for="new-avatar-color">${t('settings.colorLabel')}</label>
               <input class="form-input form-input--color" type="color" id="new-avatar-color" value="#007AFF" />
             </div>
             <div class="form-group">
-              <label class="form-label" for="new-role">Rolle</label>
+              <label class="form-label" for="new-role">${t('settings.roleLabel')}</label>
               <select class="form-input" id="new-role">
-                <option value="member">Mitglied</option>
-                <option value="admin">Admin</option>
+                <option value="member">${t('settings.roleMember')}</option>
+                <option value="admin">${t('settings.roleAdmin')}</option>
               </select>
             </div>
             <div id="member-error" class="form-error" hidden></div>
             <div class="settings-form-actions">
-              <button type="submit" class="btn btn--primary">Erstellen</button>
-              <button type="button" class="btn btn--secondary" id="cancel-add-member">Abbrechen</button>
+              <button type="submit" class="btn btn--primary">${t('settings.createMember')}</button>
+              <button type="button" class="btn btn--secondary" id="cancel-add-member">${t('settings.cancelAddMember')}</button>
             </div>
           </form>
         </div>
@@ -231,7 +245,7 @@ export async function render(container, { user }) {
 
       <!-- Abmelden -->
       <section class="settings-section">
-        <button class="btn btn--danger-outline settings-logout-btn" id="logout-btn">Abmelden</button>
+        <button class="btn btn--danger-outline settings-logout-btn" id="logout-btn">${t('settings.logout')}</button>
       </section>
     </div>
   `;
@@ -270,7 +284,7 @@ function bindEvents(container, user) {
       errorEl.hidden = true;
 
       if (newPw !== confirmPw) {
-        showError(errorEl, 'Passwörter stimmen nicht überein.');
+        showError(errorEl, t('settings.passwordMismatch'));
         return;
       }
 
@@ -279,7 +293,7 @@ function bindEvents(container, user) {
       try {
         await api.patch('/auth/me/password', { current_password: currentPw, new_password: newPw });
         passwordForm.reset();
-        window.oikos?.showToast('Passwort erfolgreich geändert.', 'success');
+        window.oikos?.showToast(t('settings.passwordSavedToast'), 'success');
       } catch (err) {
         showError(errorEl, err.message);
       } finally {
@@ -293,15 +307,15 @@ function bindEvents(container, user) {
   if (googleSyncBtn) {
     googleSyncBtn.addEventListener('click', async () => {
       googleSyncBtn.disabled = true;
-      googleSyncBtn.textContent = 'Synchronisiere…';
+      googleSyncBtn.textContent = t('settings.synchronizing');
       try {
         await api.post('/calendar/google/sync', {});
-        window.oikos?.showToast('Google Calendar synchronisiert.', 'success');
+        window.oikos?.showToast(t('settings.syncSuccess', { provider: 'Google Calendar' }), 'success');
       } catch (err) {
         window.oikos?.showToast(err.message, 'danger');
       } finally {
         googleSyncBtn.disabled = false;
-        googleSyncBtn.textContent = 'Jetzt synchronisieren';
+        googleSyncBtn.textContent = t('settings.syncNow');
       }
     });
   }
@@ -310,10 +324,10 @@ function bindEvents(container, user) {
   const googleDisconnectBtn = container.querySelector('#google-disconnect-btn');
   if (googleDisconnectBtn) {
     googleDisconnectBtn.addEventListener('click', async () => {
-      if (!confirm('Google Calendar-Verbindung trennen?')) return;
+      if (!confirm(t('settings.googleDisconnectConfirm'))) return;
       try {
         await api.delete('/calendar/google/disconnect');
-        window.oikos?.showToast('Google Calendar getrennt.', 'default');
+        window.oikos?.showToast(t('settings.disconnectedToast', { provider: 'Google Calendar' }), 'default');
         window.oikos?.navigate('/settings');
       } catch (err) {
         window.oikos?.showToast(err.message, 'danger');
@@ -326,15 +340,15 @@ function bindEvents(container, user) {
   if (appleSyncBtn) {
     appleSyncBtn.addEventListener('click', async () => {
       appleSyncBtn.disabled = true;
-      appleSyncBtn.textContent = 'Synchronisiere…';
+      appleSyncBtn.textContent = t('settings.synchronizing');
       try {
         await api.post('/calendar/apple/sync', {});
-        window.oikos?.showToast('Apple Calendar synchronisiert.', 'success');
+        window.oikos?.showToast(t('settings.syncSuccess', { provider: 'Apple Calendar' }), 'success');
       } catch (err) {
         window.oikos?.showToast(err.message, 'danger');
       } finally {
         appleSyncBtn.disabled = false;
-        appleSyncBtn.textContent = 'Jetzt synchronisieren';
+        appleSyncBtn.textContent = t('settings.syncNow');
       }
     });
   }
@@ -343,10 +357,10 @@ function bindEvents(container, user) {
   const appleDisconnectBtn = container.querySelector('#apple-disconnect-btn');
   if (appleDisconnectBtn) {
     appleDisconnectBtn.addEventListener('click', async () => {
-      if (!confirm('Apple Calendar-Verbindung trennen?')) return;
+      if (!confirm(t('settings.appleDisconnectConfirm'))) return;
       try {
         await api.delete('/calendar/apple/disconnect');
-        window.oikos?.showToast('Apple Calendar getrennt.', 'default');
+        window.oikos?.showToast(t('settings.disconnectedToast', { provider: 'Apple Calendar' }), 'default');
         window.oikos?.navigate('/settings');
       } catch (err) {
         window.oikos?.showToast(err.message, 'danger');
@@ -368,16 +382,16 @@ function bindEvents(container, user) {
       const btn      = container.querySelector('#apple-connect-btn');
 
       btn.disabled = true;
-      btn.textContent = 'Verbinde…';
+      btn.textContent = t('settings.appleConnecting');
       try {
         await api.post('/calendar/apple/connect', { url, username, password });
-        window.oikos?.showToast('Apple Calendar verbunden.', 'success');
+        window.oikos?.showToast(t('settings.appleConnectedToast'), 'success');
         window.oikos?.navigate('/settings');
       } catch (err) {
         showError(errorEl, err.message);
       } finally {
         btn.disabled = false;
-        btn.textContent = 'Verbinden & testen';
+        btn.textContent = t('settings.appleConnectBtn');
       }
     });
   }
@@ -425,7 +439,7 @@ function bindEvents(container, user) {
         addMemberForm.reset();
         container.querySelector('#add-member-form-card').classList.add('settings-card--hidden');
         container.querySelector('#add-member-btn').hidden = false;
-        window.oikos?.showToast(`${res.user.display_name} hinzugefügt.`, 'success');
+        window.oikos?.showToast(t('settings.memberAddedToast', { name: res.user.display_name }), 'success');
         bindDeleteButtons(container, user);
       } catch (err) {
         showError(errorEl, err.message);
@@ -458,11 +472,11 @@ function bindDeleteButtons(container, user) {
     btn.addEventListener('click', async () => {
       const id   = parseInt(btn.dataset.deleteUser, 10);
       const name = btn.dataset.name;
-      if (!confirm(`${name} wirklich löschen?`)) return;
+      if (!confirm(t('settings.deleteMemberConfirm', { name }))) return;
       try {
         await auth.deleteUser(id);
         btn.closest('.settings-member').remove();
-        window.oikos?.showToast(`${name} gelöscht.`, 'default');
+        window.oikos?.showToast(t('settings.memberDeletedToast', { name }), 'default');
       } catch (err) {
         window.oikos?.showToast(err.message, 'danger');
       }
@@ -480,9 +494,9 @@ function memberHtml(u) {
       <div class="settings-avatar settings-avatar--sm" style="background:${u.avatar_color}">${initials(u.display_name)}</div>
       <div class="settings-member__info">
         <span class="settings-member__name">${u.display_name}</span>
-        <span class="settings-member__meta">@${u.username} · ${u.role === 'admin' ? 'Admin' : 'Mitglied'}</span>
+        <span class="settings-member__meta">@${u.username} · ${u.role === 'admin' ? t('settings.roleAdmin') : t('settings.roleMember')}</span>
       </div>
-      <button class="btn btn--icon btn--danger-outline" data-delete-user="${u.id}" data-name="${u.display_name}" aria-label="${u.display_name} löschen" title="Löschen">
+      <button class="btn btn--icon btn--danger-outline" data-delete-user="${u.id}" data-name="${u.display_name}" aria-label="${u.display_name} ${t('settings.deleteMemberLabel')}" title="${t('settings.deleteMemberLabel')}">
         <i data-lucide="trash-2" aria-hidden="true"></i>
       </button>
     </li>
@@ -494,9 +508,10 @@ function initials(name) {
   return name.split(' ').map((w) => w[0]).slice(0, 2).join('').toUpperCase();
 }
 
-function formatDate(iso) {
+function formatDateTime(iso) {
   if (!iso) return '';
-  return new Date(iso).toLocaleString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric', hour: '2-digit', minute: '2-digit' });
+  const d = new Date(iso);
+  return `${formatDate(d)} ${formatTime(d)}`.trim();
 }
 
 function currentTheme() {
diff --git a/public/pages/shopping.js b/public/pages/shopping.js
index cd15326..b6991dc 100644
--- a/public/pages/shopping.js
+++ b/public/pages/shopping.js
@@ -6,6 +6,7 @@
 
 import { api } from '/api.js';
 import { stagger, vibrate } from '/utils/ux.js';
+import { t } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
@@ -21,6 +22,18 @@ const ITEM_CATEGORIES = [
   'Tiefkühl', 'Getränke', 'Haushalt', 'Drogerie', 'Sonstiges',
 ];
 
+const CATEGORY_LABELS = () => ({
+  'Obst & Gemüse':   t('shopping.catFruitVeg'),
+  'Backwaren':       t('shopping.catBakery'),
+  'Milchprodukte':   t('shopping.catDairy'),
+  'Fleisch & Fisch': t('shopping.catMeatFish'),
+  'Tiefkühl':        t('shopping.catFrozen'),
+  'Getränke':        t('shopping.catDrinks'),
+  'Haushalt':        t('shopping.catHousehold'),
+  'Drogerie':        t('shopping.catDrugstore'),
+  'Sonstiges':       t('shopping.catMisc'),
+});
+
 const CATEGORY_ICONS = {
   'Obst & Gemüse':  'apple',
   'Backwaren':      'wheat',
@@ -95,9 +108,9 @@ function renderListContent(container) {
     content.innerHTML = `
       <div class="no-lists">
         <i data-lucide="shopping-cart" style="width:56px;height:56px;color:var(--color-text-disabled)" aria-hidden="true"></i>
-        <div style="font-size:var(--text-lg);font-weight:var(--font-weight-semibold)">Keine Listen</div>
+        <div style="font-size:var(--text-lg);font-weight:var(--font-weight-semibold)">${t('shopping.noLists')}</div>
         <div style="font-size:var(--text-sm);color:var(--color-text-secondary)">
-          Erstelle eine Liste mit dem + Button.
+          ${t('shopping.noListsDescription')}
         </div>
       </div>`;
     if (window.lucide) window.lucide.createIcons();
@@ -110,7 +123,7 @@ function renderListContent(container) {
     <!-- Liste-Header -->
     <div class="list-header">
       <span class="list-header__name" data-action="rename-list" data-id="${state.activeList.id}"
-            role="button" tabindex="0" aria-label="Liste umbenennen">
+            role="button" tabindex="0" aria-label="${t('shopping.renameListLabel')}">
         ${state.activeList.name}
         <i data-lucide="pencil" class="list-header__edit-icon" aria-hidden="true"></i>
       </span>
@@ -119,10 +132,10 @@ function renderListContent(container) {
           <button class="btn btn--ghost" data-action="clear-checked"
                   style="font-size:var(--text-sm);color:var(--color-text-secondary)">
             <i data-lucide="trash-2" style="width:15px;height:15px" aria-hidden="true"></i>
-            Abgehakt löschen (${checkedCount})
+            ${t('shopping.clearChecked', { count: checkedCount })}
           </button>` : ''}
         <button class="btn btn--ghost btn--icon" data-action="delete-list"
-                data-id="${state.activeList.id}" aria-label="Liste löschen"
+                data-id="${state.activeList.id}" aria-label="${t('shopping.deleteListLabel')}"
                 style="color:var(--color-text-secondary)">
           <i data-lucide="trash" style="width:18px;height:18px" aria-hidden="true"></i>
         </button>
@@ -134,17 +147,17 @@ function renderListContent(container) {
       <form class="quick-add__form" id="quick-add-form" novalidate autocomplete="off">
         <div class="quick-add__input-wrap">
           <input class="quick-add__input" type="text" id="item-name-input"
-                 placeholder="Artikel hinzufügen…" aria-label="Artikelname" autocomplete="off">
+                 placeholder="${t('shopping.itemNamePlaceholder')}" aria-label="${t('shopping.itemNameLabel')}" autocomplete="off">
           <input class="quick-add__qty" type="text" id="item-qty-input"
-                 placeholder="Menge" aria-label="Menge" autocomplete="off">
+                 placeholder="${t('shopping.itemQtyPlaceholder')}" aria-label="${t('shopping.itemQtyLabel')}" autocomplete="off">
           <div class="autocomplete-dropdown" id="autocomplete-dropdown" hidden></div>
         </div>
-        <select class="quick-add__cat" id="item-cat-select" aria-label="Kategorie">
+        <select class="quick-add__cat" id="item-cat-select" aria-label="${t('shopping.categoryLabel')}">
           ${ITEM_CATEGORIES.map((c) =>
             `<option value="${c}">${c}</option>`
           ).join('')}
         </select>
-        <button class="quick-add__btn" type="submit" aria-label="Artikel hinzufügen">
+        <button class="quick-add__btn" type="submit" aria-label="${t('shopping.addItemLabel')}">
           <i data-lucide="plus" style="width:20px;height:20px" aria-hidden="true"></i>
         </button>
       </form>
@@ -170,17 +183,18 @@ function renderItems() {
           <circle cx="9" cy="21" r="1"/><circle cx="20" cy="21" r="1"/>
           <path d="M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6"/>
         </svg>
-        <div class="empty-state__title">Die Liste ist leer</div>
-        <div class="empty-state__description">Artikel über das Eingabefeld oben hinzufügen.</div>
+        <div class="empty-state__title">${t('shopping.emptyList')}</div>
+        <div class="empty-state__description">${t('shopping.emptyListDescription')}</div>
       </div>`;
   }
 
+  const catLabels = CATEGORY_LABELS();
   const groups = groupItemsByCategory(state.items);
   return groups.map(([cat, items]) => `
     <div class="item-category">
       <div class="item-category__header">
         <i data-lucide="${CATEGORY_ICONS[cat] ?? 'tag'}" class="item-category__icon" aria-hidden="true"></i>
-        ${cat}
+        ${catLabels[cat] || cat}
       </div>
       ${items.map(renderItem).join('')}
     </div>`).join('');
@@ -192,17 +206,17 @@ function renderItem(item) {
     <div class="swipe-row" data-swipe-id="${item.id}" data-swipe-checked="${item.is_checked}">
       <div class="swipe-reveal swipe-reveal--done" aria-hidden="true">
         <i data-lucide="${isDone ? 'rotate-ccw' : 'check'}" style="width:22px;height:22px" aria-hidden="true"></i>
-        <span>${isDone ? 'Zurück' : 'Abhaken'}</span>
+        <span>${isDone ? t('shopping.swipeBack') : t('shopping.swipeCheck')}</span>
       </div>
       <div class="swipe-reveal swipe-reveal--delete" aria-hidden="true">
         <i data-lucide="trash-2" style="width:22px;height:22px" aria-hidden="true"></i>
-        <span>Löschen</span>
+        <span>${t('shopping.swipeDelete')}</span>
       </div>
       <div class="shopping-item ${isDone ? 'shopping-item--checked' : ''}"
            data-item-id="${item.id}">
         <button class="item-check ${isDone ? 'item-check--checked' : ''}"
                 data-action="toggle-item" data-id="${item.id}" data-checked="${item.is_checked}"
-                aria-label="${escHtml(item.name)} ${isDone ? 'als nicht erledigt markieren' : 'abhaken'}">
+                aria-label="${isDone ? t('shopping.markUndoneLabel', { name: escHtml(item.name) }) : t('shopping.markDoneLabel', { name: escHtml(item.name) })}">
           <i data-lucide="check" class="item-check__icon" aria-hidden="true"></i>
         </button>
         <div class="item-body">
@@ -210,7 +224,7 @@ function renderItem(item) {
           ${item.quantity ? `<div class="item-quantity">${escHtml(item.quantity)}</div>` : ''}
         </div>
         <button class="item-delete" data-action="delete-item" data-id="${item.id}"
-                aria-label="${escHtml(item.name)} löschen">
+                aria-label="${t('shopping.deleteItemLabel', { name: escHtml(item.name) })}">
           <i data-lucide="x" style="width:16px;height:16px" aria-hidden="true"></i>
         </button>
       </div>
@@ -474,7 +488,7 @@ function updateItemsList(container) {
         <button class="btn btn--ghost" data-action="clear-checked"
                 style="font-size:var(--text-sm);color:var(--color-text-secondary)">
           <i data-lucide="trash-2" style="width:15px;height:15px" aria-hidden="true"></i>
-          Abgehakt löschen (${checkedCount})
+          ${t('shopping.clearChecked', { count: checkedCount })}
         </button>`);
       if (window.lucide) window.lucide.createIcons();
     } else if (clearBtn) {
@@ -483,7 +497,7 @@ function updateItemsList(container) {
       } else {
         clearBtn.innerHTML = `
           <i data-lucide="trash-2" style="width:15px;height:15px" aria-hidden="true"></i>
-          Abgehakt löschen (${checkedCount})`;
+          ${t('shopping.clearChecked', { count: checkedCount })}`;
         if (window.lucide) window.lucide.createIcons();
       }
     }
@@ -509,7 +523,7 @@ async function loadLists() {
   } catch (err) {
     console.error('[Shopping] loadLists Fehler:', err);
     state.lists = [];
-    window.oikos?.showToast('Listen konnten nicht geladen werden.', 'danger');
+    window.oikos?.showToast(t('shopping.listsLoadError'), 'danger');
   }
 }
 
@@ -528,7 +542,7 @@ async function switchList(listId, container) {
     console.error('[Shopping] loadItems Fehler:', err);
     state.items = [];
     state.activeList = state.lists.find((l) => l.id === listId) ?? null;
-    window.oikos?.showToast('Artikel konnten nicht geladen werden.', 'danger');
+    window.oikos?.showToast(t('shopping.itemsLoadError'), 'danger');
   }
   renderListContent(container);
   wireListContentEvents(container);
@@ -548,7 +562,7 @@ function wireTabBar(container) {
     }
 
     if (target.dataset.action === 'new-list') {
-      const name = prompt('Name der neuen Liste:');
+      const name = prompt(t('shopping.newListPrompt'));
       if (!name?.trim()) return;
       try {
         const data = await api.post('/shopping', { name: name.trim() });
@@ -621,7 +635,7 @@ function wireListContentEvents(container) {
         updateItemsList(container);
         updateListCounter(state.activeListId, -count, -count);
         renderTabs(container);
-        window.oikos.showToast(`${count} Artikel entfernt.`);
+        window.oikos.showToast(t('shopping.itemsRemovedToast', { count }));
       } catch (err) {
         window.oikos.showToast(err.message, 'danger');
       }
@@ -629,7 +643,7 @@ function wireListContentEvents(container) {
 
     // ---- Liste umbenennen ----
     if (action === 'rename-list') {
-      const newName = prompt('Neuer Listen-Name:', state.activeList?.name);
+      const newName = prompt(t('shopping.renameListPrompt'), state.activeList?.name);
       if (!newName?.trim() || newName.trim() === state.activeList?.name) return;
       try {
         const data = await api.put(`/shopping/${state.activeListId}`, { name: newName.trim() });
@@ -646,7 +660,7 @@ function wireListContentEvents(container) {
 
     // ---- Liste löschen ----
     if (action === 'delete-list') {
-      if (!confirm(`Liste "${state.activeList?.name}" und alle Artikel löschen?`)) return;
+      if (!confirm(t('shopping.deleteListConfirm', { name: state.activeList?.name }))) return;
       try {
         await api.delete(`/shopping/${state.activeListId}`);
         state.lists = state.lists.filter((l) => l.id !== state.activeListId);
@@ -659,7 +673,7 @@ function wireListContentEvents(container) {
           renderTabs(container);
           renderListContent(container);
         }
-        window.oikos.showToast('Liste gelöscht.');
+        window.oikos.showToast(t('shopping.deletedListToast'));
       } catch (err) {
         window.oikos.showToast(err.message, 'danger');
       }
@@ -701,15 +715,15 @@ export async function render(container, { user }) {
     }
   } catch (err) {
     console.error('[Shopping] Ladefehler:', err.message);
-    window.oikos.showToast('Einkaufslisten konnten nicht geladen werden.', 'danger');
+    window.oikos.showToast(t('shopping.listsLoadError'), 'danger');
   }
 
   container.innerHTML = `
     <div class="shopping-page">
-      <h1 class="sr-only">Einkaufslisten</h1>
+      <h1 class="sr-only">${t('shopping.title')}</h1>
       <div class="list-tabs-bar" id="list-tabs-bar"></div>
       <div id="list-content" style="flex:1;display:flex;flex-direction:column;overflow:hidden"></div>
-      <button class="page-fab" id="fab-new-item" aria-label="Artikel hinzufügen">
+      <button class="page-fab" id="fab-new-item" aria-label="${t('shopping.addItemLabel')}">
         <i data-lucide="plus" style="width:24px;height:24px" aria-hidden="true"></i>
       </button>
     </div>
diff --git a/public/pages/tasks.js b/public/pages/tasks.js
index da28ae2..4621be7 100644
--- a/public/pages/tasks.js
+++ b/public/pages/tasks.js
@@ -8,31 +8,43 @@ import { api } from '/api.js';
 import { renderRRuleFields, bindRRuleEvents, getRRuleValues } from '/rrule-ui.js';
 import { openModal as openSharedModal, closeModal, wireBlurValidation, btnSuccess, btnError } from '/components/modal.js';
 import { stagger, vibrate } from '/utils/ux.js';
+import { t, formatDate } from '/i18n.js';
 
 // --------------------------------------------------------
 // Konstanten
 // --------------------------------------------------------
 
-const PRIORITIES = [
-  { value: 'urgent', label: 'Dringend',  color: 'var(--color-priority-urgent)' },
-  { value: 'high',   label: 'Hoch',      color: 'var(--color-priority-high)'   },
-  { value: 'medium', label: 'Mittel',    color: 'var(--color-priority-medium)' },
-  { value: 'low',    label: 'Niedrig',   color: 'var(--color-priority-low)'    },
+const PRIORITIES = () => [
+  { value: 'urgent', label: t('tasks.priorityUrgent'), color: 'var(--color-priority-urgent)' },
+  { value: 'high',   label: t('tasks.priorityHigh'),   color: 'var(--color-priority-high)'   },
+  { value: 'medium', label: t('tasks.priorityMedium'), color: 'var(--color-priority-medium)' },
+  { value: 'low',    label: t('tasks.priorityLow'),    color: 'var(--color-priority-low)'    },
 ];
 
-const STATUSES = [
-  { value: 'open',        label: 'Offen'        },
-  { value: 'in_progress', label: 'In Bearbeitung'},
-  { value: 'done',        label: 'Erledigt'      },
+const STATUSES = () => [
+  { value: 'open',        label: t('tasks.statusOpen')       },
+  { value: 'in_progress', label: t('tasks.statusInProgress') },
+  { value: 'done',        label: t('tasks.statusDone')       },
 ];
 
 const CATEGORIES = [
-  'Haushalt','Schule','Einkauf','Reparatur',
-  'Gesundheit','Finanzen','Freizeit','Sonstiges',
+  'Haushalt', 'Schule', 'Einkauf', 'Reparatur',
+  'Gesundheit', 'Finanzen', 'Freizeit', 'Sonstiges',
 ];
 
-const PRIORITY_LABELS = Object.fromEntries(PRIORITIES.map((p) => [p.value, p.label]));
-const STATUS_LABELS   = Object.fromEntries(STATUSES.map((s)  => [s.value, s.label]));
+const CATEGORY_LABELS = () => ({
+  'Haushalt':    t('tasks.categoryHousehold'),
+  'Schule':      t('tasks.categorySchool'),
+  'Einkauf':     t('tasks.categoryShopping'),
+  'Reparatur':   t('tasks.categoryRepair'),
+  'Gesundheit':  t('tasks.categoryHealth'),
+  'Finanzen':    t('tasks.categoryFinance'),
+  'Freizeit':    t('tasks.categoryLeisure'),
+  'Sonstiges':   t('tasks.categoryMisc'),
+});
+
+const PRIORITY_LABELS = () => Object.fromEntries(PRIORITIES().map((p) => [p.value, p.label]));
+const STATUS_LABELS   = () => Object.fromEntries(STATUSES().map((s)  => [s.value, s.label]));
 
 // --------------------------------------------------------
 // Hilfsfunktionen
@@ -49,10 +61,10 @@ function formatDueDate(dateStr) {
   now.setHours(0, 0, 0, 0);
   const diffDays = Math.round((due - now) / 86400000);
 
-  if (diffDays < 0)  return { label: `${Math.abs(diffDays)}d überfällig`, cls: 'due-date--overdue' };
-  if (diffDays === 0) return { label: 'Heute fällig',                      cls: 'due-date--today'   };
-  if (diffDays === 1) return { label: 'Morgen fällig',                     cls: ''                  };
-  return { label: due.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit' }), cls: '' };
+  if (diffDays < 0)  return { label: t('tasks.overdueDay', { count: Math.abs(diffDays) }), cls: 'due-date--overdue' };
+  if (diffDays === 0) return { label: t('tasks.dueToday'),   cls: 'due-date--today' };
+  if (diffDays === 1) return { label: t('tasks.dueTomorrow'), cls: ''                };
+  return { label: formatDate(due), cls: '' };
 }
 
 function groupBy(tasks, mode) {
@@ -67,21 +79,28 @@ function groupBy(tasks, mode) {
   }
 
   // mode === 'due'
-  for (const t of tasks) {
+  const groupOverdue  = t('tasks.groupOverdue');
+  const groupToday    = t('tasks.groupToday');
+  const groupThisWeek = t('tasks.groupThisWeek');
+  const groupNextWeek = t('tasks.groupNextWeek');
+  const groupLater    = t('tasks.groupLater');
+  const groupNoDate   = t('tasks.groupNoDate');
+
+  for (const task of tasks) {
     let key;
-    if (!t.due_date)                  key = 'Kein Datum';
+    if (!task.due_date)                  key = groupNoDate;
     else {
-      const diff = Math.round((new Date(t.due_date) - new Date().setHours(0,0,0,0)) / 86400000);
-      if (diff < 0)       key = 'Überfällig';
-      else if (diff === 0) key = 'Heute';
-      else if (diff <= 3)  key = 'Diese Woche';
-      else if (diff <= 7)  key = 'Nächste Woche';
-      else                 key = 'Später';
+      const diff = Math.round((new Date(task.due_date) - new Date().setHours(0,0,0,0)) / 86400000);
+      if (diff < 0)       key = groupOverdue;
+      else if (diff === 0) key = groupToday;
+      else if (diff <= 3)  key = groupThisWeek;
+      else if (diff <= 7)  key = groupNextWeek;
+      else                 key = groupLater;
     }
-    (groups[key] = groups[key] || []).push(t);
+    (groups[key] = groups[key] || []).push(task);
   }
 
-  const order = ['Überfällig', 'Heute', 'Diese Woche', 'Nächste Woche', 'Später', 'Kein Datum'];
+  const order = [groupOverdue, groupToday, groupThisWeek, groupNextWeek, groupLater, groupNoDate];
   return order.filter((k) => groups[k]).map((k) => [k, groups[k]]);
 }
 
@@ -92,7 +111,7 @@ function groupBy(tasks, mode) {
 function renderPriorityBadge(priority) {
   return `<span class="priority-badge priority-badge--${priority}">
     <span class="priority-dot priority-dot--${priority}"></span>
-    ${PRIORITY_LABELS[priority] ?? priority}
+    ${PRIORITY_LABELS()[priority] ?? priority}
   </span>`;
 }
 
@@ -110,11 +129,11 @@ function renderSwipeRow(task, innerHtml) {
     <div class="swipe-row" data-swipe-id="${task.id}" data-swipe-status="${task.status}">
       <div class="swipe-reveal swipe-reveal--done" aria-hidden="true">
         <i data-lucide="${isDone ? 'rotate-ccw' : 'check'}" style="width:22px;height:22px" aria-hidden="true"></i>
-        <span>${isDone ? 'Öffnen' : 'Erledigt'}</span>
+        <span>${isDone ? t('tasks.swipeOpen') : t('tasks.swipeDone')}</span>
       </div>
       <div class="swipe-reveal swipe-reveal--edit" aria-hidden="true">
         <i data-lucide="pencil" style="width:22px;height:22px" aria-hidden="true"></i>
-        <span>Bearbeiten</span>
+        <span>${t('tasks.swipeEdit')}</span>
       </div>
       ${innerHtml}
     </div>`;
@@ -133,7 +152,7 @@ function renderTaskCard(task, opts = {}) {
              data-subtask-id="${s.id}">
           <button class="subtask-item__checkbox ${s.status === 'done' ? 'subtask-item__checkbox--done' : ''}"
                   data-action="toggle-subtask" data-id="${s.id}"
-                  data-status="${s.status}" aria-label="${s.title} als erledigt markieren">
+                  data-status="${s.status}" aria-label="${t('tasks.subtaskMarkDone', { title: s.title })}">
             ${s.status === 'done' ? '<i data-lucide="check" style="width:10px;height:10px;color:#fff" aria-hidden="true"></i>' : ''}
           </button>
           <span class="subtask-item__title">${s.title}</span>
@@ -145,7 +164,7 @@ function renderTaskCard(task, opts = {}) {
       <div class="task-card__main">
         <button class="task-status-btn task-status-btn--${task.status}"
                 data-action="toggle-status" data-id="${task.id}" data-status="${task.status}"
-                aria-label="${task.title} als erledigt markieren">
+                aria-label="${t('tasks.markDone', { title: task.title })}">
           <i data-lucide="check" class="task-status-btn__check" aria-hidden="true"></i>
         </button>
 
@@ -156,8 +175,8 @@ function renderTaskCard(task, opts = {}) {
           <div class="task-card__meta">
             ${renderPriorityBadge(task.priority)}
             ${renderDueDate(task.due_date)}
-            ${task.is_recurring ? '<span class="due-date" aria-label="Wiederkehrend"><i data-lucide="repeat" style="width:12px;height:12px" aria-hidden="true"></i></span>' : ''}
-            ${task.category !== 'Sonstiges' ? `<span class="due-date">${task.category}</span>` : ''}
+            ${task.is_recurring ? `<span class="due-date" aria-label="${t('tasks.recurring')}"><i data-lucide="repeat" style="width:12px;height:12px" aria-hidden="true"></i></span>` : ''}
+            ${task.category !== 'Sonstiges' ? `<span class="due-date">${CATEGORY_LABELS()[task.category] ?? task.category}</span>` : ''}
           </div>
         </div>
 
@@ -168,14 +187,14 @@ function renderTaskCard(task, opts = {}) {
           </div>` : ''}
 
         <button class="btn btn--ghost btn--icon" data-action="edit-task" data-id="${task.id}"
-                aria-label="Aufgabe bearbeiten" style="min-height:unset;width:36px;height:36px">
+                aria-label="${t('tasks.editButton')}" style="min-height:unset;width:36px;height:36px">
           <i data-lucide="pencil" style="width:16px;height:16px" aria-hidden="true"></i>
         </button>
       </div>
 
       ${progress !== null ? `
         <div class="subtask-progress" data-action="toggle-subtasks" data-id="${task.id}"
-             aria-label="Teilaufgaben anzeigen">
+             aria-label="${t('tasks.subtaskToggle')}">
           <div class="subtask-progress__bar-wrap">
             <div class="subtask-progress__bar-fill" style="width:${progress}%"></div>
           </div>
@@ -187,7 +206,7 @@ function renderTaskCard(task, opts = {}) {
              id="subtasks-${task.id}">
           ${subtasksHtml}
           <button class="subtask-item__add" data-action="add-subtask" data-parent="${task.id}">
-            + Teilaufgabe hinzufügen
+            ${t('tasks.subtaskAdd')}
           </button>
         </div>` : ''}
     </div>`;
@@ -200,8 +219,8 @@ function renderTaskGroups(tasks, groupMode) {
         <path d="M22 11.08V12a10 10 0 1 1-5.93-9.14"/>
         <polyline points="22 4 12 14.01 9 11.01"/>
       </svg>
-      <div class="empty-state__title">Keine Aufgaben — alles erledigt?</div>
-      <div class="empty-state__description">Neue Aufgaben über den + Button erstellen.</div>
+      <div class="empty-state__title">${t('tasks.emptyTitle')}</div>
+      <div class="empty-state__description">${t('tasks.emptyDescription')}</div>
     </div>`;
   }
 
@@ -227,11 +246,12 @@ function renderModalContent({ task = null, users = [] } = {}) {
     `<option value="${u.id}" ${task?.assigned_to === u.id ? 'selected' : ''}>${u.display_name}</option>`
   ).join('');
 
+  const catLabels = CATEGORY_LABELS();
   const categoryOptions = CATEGORIES.map((c) =>
-    `<option value="${c}" ${(task?.category ?? 'Sonstiges') === c ? 'selected' : ''}>${c}</option>`
+    `<option value="${c}" ${(task?.category ?? 'Sonstiges') === c ? 'selected' : ''}>${catLabels[c] ?? c}</option>`
   ).join('');
 
-  const priorityOptions = PRIORITIES.map((p) =>
+  const priorityOptions = PRIORITIES().map((p) =>
     `<option value="${p.value}" ${(task?.priority ?? 'medium') === p.value ? 'selected' : ''}>${p.label}</option>`
   ).join('');
 
@@ -241,36 +261,36 @@ function renderModalContent({ task = null, users = [] } = {}) {
 
       <div class="form-group">
         <div class="form-field">
-          <label class="label" for="task-title">Titel *</label>
+          <label class="label" for="task-title">${t('tasks.titleLabel')}</label>
           <input class="input" type="text" id="task-title" name="title"
-                 value="${task?.title ?? ''}" placeholder="Was muss erledigt werden?"
+                 value="${task?.title ?? ''}" placeholder="${t('tasks.titlePlaceholder')}"
                  required autocomplete="off">
           <div class="form-field__error">
             <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor"
                  stroke-width="2" aria-hidden="true"><circle cx="12" cy="12" r="10"/>
                  <line x1="12" y1="8" x2="12" y2="12"/><line x1="12" y1="16" x2="12" y2="16.01"/>
             </svg>
-            Dieses Feld ist erforderlich.
+            ${t('common.required')}
           </div>
         </div>
       </div>
 
       <div class="form-group">
-        <label class="label" for="task-description">Notiz</label>
+        <label class="label" for="task-description">${t('tasks.descriptionLabel')}</label>
         <textarea class="input" id="task-description" name="description"
-                  rows="2" placeholder="Optionale Details…"
+                  rows="2" placeholder="${t('tasks.descriptionPlaceholder')}"
                   style="resize:vertical">${task?.description ?? ''}</textarea>
       </div>
 
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)">
         <div class="form-group" style="margin-bottom:0">
-          <label class="label" for="task-priority">Priorität</label>
+          <label class="label" for="task-priority">${t('tasks.priorityLabel')}</label>
           <select class="input" id="task-priority" name="priority" style="min-height:44px">
             ${priorityOptions}
           </select>
         </div>
         <div class="form-group" style="margin-bottom:0">
-          <label class="label" for="task-category">Kategorie</label>
+          <label class="label" for="task-category">${t('tasks.categoryLabel')}</label>
           <select class="input" id="task-category" name="category" style="min-height:44px">
             ${categoryOptions}
           </select>
@@ -279,30 +299,30 @@ function renderModalContent({ task = null, users = [] } = {}) {
 
       <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3);margin-top:var(--space-4)">
         <div class="form-group" style="margin-bottom:0">
-          <label class="label" for="task-due-date">Fälligkeit</label>
+          <label class="label" for="task-due-date">${t('tasks.dueDateLabel')}</label>
           <input class="input" type="date" id="task-due-date" name="due_date"
                  value="${task?.due_date ?? ''}">
         </div>
         <div class="form-group" style="margin-bottom:0">
-          <label class="label" for="task-due-time">Uhrzeit</label>
+          <label class="label" for="task-due-time">${t('tasks.dueTimeLabel')}</label>
           <input class="input" type="time" id="task-due-time" name="due_time"
                  value="${task?.due_time ?? ''}">
         </div>
       </div>
 
       <div class="form-group" style="margin-top:var(--space-4)">
-        <label class="label" for="task-assigned">Zugewiesen an</label>
+        <label class="label" for="task-assigned">${t('tasks.assignedLabel')}</label>
         <select class="input" id="task-assigned" name="assigned_to" style="min-height:44px">
-          <option value="">— Niemand —</option>
+          <option value="">${t('tasks.assignedNobody')}</option>
           ${userOptions}
         </select>
       </div>
 
       ${isEdit ? `
         <div class="form-group">
-          <label class="label" for="task-status">Status</label>
+          <label class="label" for="task-status">${t('tasks.statusLabel')}</label>
           <select class="input" id="task-status" name="status" style="min-height:44px">
-            ${STATUSES.map((s) =>
+            ${STATUSES().map((s) =>
               `<option value="${s.value}" ${task.status === s.value ? 'selected' : ''}>${s.label}</option>`
             ).join('')}
           </select>
@@ -315,9 +335,9 @@ function renderModalContent({ task = null, users = [] } = {}) {
       <div class="modal-panel__footer" style="padding:0;border:none;margin-top:var(--space-6)">
         ${isEdit ? `
           <button type="button" class="btn btn--danger" data-action="delete-task"
-                  data-id="${task.id}">Löschen</button>` : ''}
+                  data-id="${task.id}">${t('common.delete')}</button>` : ''}
         <button type="submit" class="btn btn--primary" id="task-submit-btn">
-          ${isEdit ? 'Speichern' : 'Erstellen'}
+          ${isEdit ? t('common.save') : t('common.create')}
         </button>
       </div>
     </form>`;
@@ -375,7 +395,7 @@ async function loadTaskForEdit(id) {
 function openTaskModal({ task = null, users = [] } = {}, container) {
   const isEdit = !!task;
   openSharedModal({
-    title: isEdit ? 'Aufgabe bearbeiten' : 'Neue Aufgabe',
+    title: isEdit ? t('tasks.editTask') : t('tasks.newTask'),
     content: renderModalContent({ task, users }),
     size: 'lg',
     onSave(panel) {
@@ -408,9 +428,9 @@ async function handleFormSubmit(e, container) {
 
   errorEl.hidden = true;
   submitBtn.disabled = true;
-  submitBtn.textContent = 'Wird gespeichert…';
+  submitBtn.textContent = t('common.saving');
 
-  const originalLabel = taskId ? 'Speichern' : 'Erstellen';
+  const originalLabel = taskId ? t('common.save') : t('common.create');
 
   const rrule = getRRuleValues(document, 'task');
   const body = {
@@ -429,10 +449,10 @@ async function handleFormSubmit(e, container) {
   try {
     if (taskId) {
       await api.put(`/tasks/${taskId}`, body);
-      window.oikos.showToast('Aufgabe gespeichert.', 'success');
+      window.oikos.showToast(t('tasks.savedToast'), 'success');
     } else {
       await api.post('/tasks', body);
-      window.oikos.showToast('Aufgabe erstellt.', 'success');
+      window.oikos.showToast(t('tasks.createdToast'), 'success');
     }
     btnSuccess(submitBtn, originalLabel);
     setTimeout(() => closeModal(), 700);
@@ -447,11 +467,11 @@ async function handleFormSubmit(e, container) {
 }
 
 async function handleDeleteTask(id, container) {
-  if (!confirm('Aufgabe und alle Teilaufgaben löschen?')) return;
+  if (!confirm(t('tasks.deleteConfirm'))) return;
   try {
     await api.delete(`/tasks/${id}`);
     closeModal();
-    window.oikos.showToast('Aufgabe gelöscht.', 'default');
+    window.oikos.showToast(t('tasks.deletedToast'), 'default');
     await loadTasks(container);
   } catch (err) {
     window.oikos.showToast(err.message, 'danger');
@@ -459,7 +479,7 @@ async function handleDeleteTask(id, container) {
 }
 
 async function handleAddSubtask(parentId, container) {
-  const title = prompt('Teilaufgabe:');
+  const title = prompt(t('tasks.subtaskPrompt'));
   if (!title?.trim()) return;
   try {
     await api.post('/tasks', { title: title.trim(), parent_task_id: parentId });
@@ -473,10 +493,10 @@ async function handleAddSubtask(parentId, container) {
 // Kanban-Ansicht
 // --------------------------------------------------------
 
-const KANBAN_COLS = [
-  { status: 'open',        label: 'Offen',         colorVar: '--color-text-secondary' },
-  { status: 'in_progress', label: 'In Bearbeitung', colorVar: '--color-warning'        },
-  { status: 'done',        label: 'Erledigt',       colorVar: '--color-success'        },
+const KANBAN_COLS = () => [
+  { status: 'open',        label: t('tasks.kanbanOpen'),       colorVar: '--color-text-secondary' },
+  { status: 'in_progress', label: t('tasks.kanbanInProgress'), colorVar: '--color-warning'        },
+  { status: 'done',        label: t('tasks.kanbanDone'),       colorVar: '--color-success'        },
 ];
 
 function renderKanbanCard(task) {
@@ -503,8 +523,9 @@ function renderKanban(container) {
   const listEl = container.querySelector('#task-list');
   if (!listEl) return;
 
+  const cols = KANBAN_COLS();
   const grouped = {};
-  for (const col of KANBAN_COLS) grouped[col.status] = [];
+  for (const col of cols) grouped[col.status] = [];
   for (const t of state.tasks) {
     if (grouped[t.status]) grouped[t.status].push(t);
     else grouped['open'].push(t);
@@ -512,7 +533,7 @@ function renderKanban(container) {
 
   listEl.innerHTML = `
     <div class="kanban-board">
-      ${KANBAN_COLS.map((col) => `
+      ${cols.map((col) => `
         <div class="kanban-col" data-status="${col.status}">
           <div class="kanban-col__header">
             <span class="kanban-col__title" style="color:${col.colorVar.startsWith('--') ? `var(${col.colorVar})` : col.colorVar}">
@@ -606,7 +627,7 @@ function wireKanbanDrag(container) {
         const task = await loadTaskForEdit(card.dataset.taskId);
         openTaskModal({ task, users: state.users }, container);
       } catch (err) {
-        window.oikos.showToast('Aufgabe konnte nicht geladen werden.', 'danger');
+        window.oikos.showToast(t('tasks.loadError'), 'danger');
       }
     }
   });
@@ -635,15 +656,17 @@ function renderFilters(container) {
   if (!bar) return;
 
   const chips = [];
+  const statusLabels   = STATUS_LABELS();
+  const priorityLabels = PRIORITY_LABELS();
   if (state.filters.status) {
     chips.push(`<span class="filter-chip filter-chip--active" data-filter="status">
-      ${STATUS_LABELS[state.filters.status]}
+      ${statusLabels[state.filters.status]}
       <span class="filter-chip__remove" aria-hidden="true">×</span>
     </span>`);
   }
   if (state.filters.priority) {
     chips.push(`<span class="filter-chip filter-chip--active" data-filter="priority">
-      ${PRIORITY_LABELS[state.filters.priority]}
+      ${priorityLabels[state.filters.priority]}
       <span class="filter-chip__remove" aria-hidden="true">×</span>
     </span>`);
   }
@@ -657,12 +680,12 @@ function renderFilters(container) {
 
   // Inaktive Filter-Chips (zum Aktivieren)
   if (!state.filters.status) {
-    STATUSES.forEach((s) => {
+    STATUSES().forEach((s) => {
       chips.push(`<span class="filter-chip" data-filter="status" data-value="${s.value}">${s.label}</span>`);
     });
   }
   if (!state.filters.priority) {
-    PRIORITIES.forEach((p) => {
+    PRIORITIES().forEach((p) => {
       chips.push(`<span class="filter-chip" data-filter="priority" data-value="${p.value}">${p.label}</span>`);
     });
   }
@@ -802,7 +825,7 @@ function wireSwipeGestures(container) {
           const task = await loadTaskForEdit(taskId);
           openTaskModal({ task, users: state.users }, container);
         } catch (err) {
-          window.oikos.showToast('Aufgabe konnte nicht geladen werden.', 'danger');
+          window.oikos.showToast(t('tasks.loadError'), 'danger');
         }
 
       } else {
@@ -912,7 +935,7 @@ function wireTaskList(container) {
         const task = await loadTaskForEdit(id);
         openTaskModal({ task, users: state.users }, container);
       } catch (err) {
-        window.oikos.showToast('Aufgabe konnte nicht geladen werden.', 'danger');
+        window.oikos.showToast(t('tasks.loadError'), 'danger');
       }
     }
 
@@ -931,24 +954,24 @@ export async function render(container, { user }) {
   container.innerHTML = `
     <div class="tasks-page">
       <div class="tasks-toolbar">
-        <h1 class="tasks-toolbar__title">Aufgaben</h1>
+        <h1 class="tasks-toolbar__title">${t('tasks.title')}</h1>
         <div class="tasks-toolbar__actions">
           <div class="group-toggle" id="view-toggle">
             <button class="group-toggle__btn group-toggle__btn--active" data-view="list"
-                    title="Listenansicht" aria-label="Listenansicht">
+                    title="${t('tasks.listView')}" aria-label="${t('tasks.listView')}">
               <i data-lucide="list" style="width:14px;height:14px;pointer-events:none" aria-hidden="true"></i>
             </button>
             <button class="group-toggle__btn" data-view="kanban"
-                    title="Kanban-Ansicht" aria-label="Kanban-Ansicht">
+                    title="${t('tasks.kanbanView')}" aria-label="${t('tasks.kanbanView')}">
               <i data-lucide="columns" style="width:14px;height:14px;pointer-events:none" aria-hidden="true"></i>
             </button>
           </div>
           <div class="group-toggle" id="group-mode-toggle">
-            <button class="group-toggle__btn group-toggle__btn--active" data-mode="category">Kategorie</button>
-            <button class="group-toggle__btn" data-mode="due">Fälligkeit</button>
+            <button class="group-toggle__btn group-toggle__btn--active" data-mode="category">${t('tasks.categoryLabel')}</button>
+            <button class="group-toggle__btn" data-mode="due">${t('tasks.dueDateLabel')}</button>
           </div>
           <button class="btn btn--primary" id="btn-new-task" style="gap:var(--space-1)">
-            <i data-lucide="plus" style="width:18px;height:18px" aria-hidden="true"></i> Neu
+            <i data-lucide="plus" style="width:18px;height:18px" aria-hidden="true"></i> ${t('tasks.newTask')}
           </button>
         </div>
       </div>
@@ -963,7 +986,7 @@ export async function render(container, { user }) {
             <div class="skeleton skeleton-line skeleton-line--short" style="height:12px"></div>
           </div>`).join('')}
       </div>
-      <button class="page-fab" id="fab-new-task" aria-label="Neue Aufgabe">
+      <button class="page-fab" id="fab-new-task" aria-label="${t('tasks.newTask')}">
         <i data-lucide="plus" style="width:24px;height:24px" aria-hidden="true"></i>
       </button>
     </div>
@@ -981,7 +1004,7 @@ export async function render(container, { user }) {
     state.users = metaData.users ?? [];
   } catch (err) {
     console.error('[Tasks] Ladefehler:', err.message);
-    window.oikos.showToast('Aufgaben konnten nicht geladen werden.', 'danger');
+    window.oikos.showToast(t('tasks.loadError'), 'danger');
     state.tasks = [];
     state.users = [];
   }
diff --git a/public/router.js b/public/router.js
index e4e1745..5f21124 100644
--- a/public/router.js
+++ b/public/router.js
@@ -5,6 +5,7 @@
  */
 
 import { auth } from '/api.js';
+import { initI18n, getLocale, t } from '/i18n.js';
 
 // --------------------------------------------------------
 // Routen-Definitionen
@@ -215,8 +216,8 @@ async function renderPage(route, previousPath = null) {
  */
 function renderAppShell(container) {
   container.innerHTML = `
-    <a href="#page-content" class="sr-only">Zum Inhalt springen</a>
-    <nav class="nav-sidebar" aria-label="Hauptnavigation">
+    <a href="#page-content" class="sr-only">${t('common.skipToContent')}</a>
+    <nav class="nav-sidebar" aria-label="${t('nav.main')}">
       <div class="nav-sidebar__logo"><span>Oikos</span></div>
       <div class="nav-sidebar__items" role="list">
         ${navItems().map(navItemHtml).join('')}
@@ -226,7 +227,7 @@ function renderAppShell(container) {
     <main class="app-content" id="page-content" aria-live="polite">
     </main>
 
-    <nav class="nav-bottom" aria-label="Navigation">
+    <nav class="nav-bottom" aria-label="${t('nav.navigation')}">
       <div class="nav-bottom__dots" aria-hidden="true">
         <span class="nav-bottom__dot nav-bottom__dot--active"></span>
         <span class="nav-bottom__dot"></span>
@@ -285,15 +286,15 @@ function scrollNavToActive() {
 
 function navItems() {
   return [
-    { path: '/',         label: 'Übersicht',   icon: 'layout-dashboard' },
-    { path: '/tasks',    label: 'Aufgaben',    icon: 'check-square'     },
-    { path: '/calendar', label: 'Kalender',    icon: 'calendar'         },
-    { path: '/meals',    label: 'Essen',        icon: 'utensils'         },
-    { path: '/shopping', label: 'Einkauf',     icon: 'shopping-cart'    },
-    { path: '/notes',    label: 'Pinnwand',    icon: 'sticky-note'      },
-    { path: '/contacts', label: 'Kontakte',    icon: 'book-user'        },
-    { path: '/budget',   label: 'Budget',      icon: 'wallet'           },
-    { path: '/settings', label: 'Einstellungen', icon: 'settings'       },
+    { path: '/',         label: t('nav.dashboard'), icon: 'layout-dashboard' },
+    { path: '/tasks',    label: t('nav.tasks'),     icon: 'check-square'     },
+    { path: '/calendar', label: t('nav.calendar'),  icon: 'calendar'         },
+    { path: '/meals',    label: t('nav.meals'),     icon: 'utensils'         },
+    { path: '/shopping', label: t('nav.shopping'),  icon: 'shopping-cart'    },
+    { path: '/notes',    label: t('nav.notes'),     icon: 'sticky-note'      },
+    { path: '/contacts', label: t('nav.contacts'),  icon: 'book-user'        },
+    { path: '/budget',   label: t('nav.budget'),    icon: 'wallet'           },
+    { path: '/settings', label: t('nav.settings'),  icon: 'settings'         },
   ];
 }
 
@@ -331,9 +332,9 @@ function updateNav(path) {
 function renderError(container, err) {
   container.innerHTML = `
     <div class="empty-state">
-      <div class="empty-state__title">Etwas ist schiefgelaufen.</div>
+      <div class="empty-state__title">${t('common.errorOccurred')}</div>
       <div class="empty-state__description">${err.message}</div>
-      <button class="btn btn--primary" id="error-reload-btn">Neu laden</button>
+      <button class="btn btn--primary" id="error-reload-btn">${t('common.reload')}</button>
     </div>
   `;
   container.querySelector('#error-reload-btn')?.addEventListener('click', () => location.reload());
@@ -377,14 +378,14 @@ window.addEventListener('error', (e) => {
   // Ressource-Ladefehler (z.B. fehlgeschlagenes Bild): ignorieren
   if (e.target && e.target !== window) return;
   console.error('[Oikos] Unbehandelter Fehler:', e.error ?? e.message);
-  showToast('Ein unerwarteter Fehler ist aufgetreten.', 'danger');
+  showToast(t('common.unexpectedError'), 'danger');
 });
 
 window.addEventListener('unhandledrejection', (e) => {
   // Auth-Fehler werden bereits von auth:expired behandelt
   if (e.reason?.status === 401) return;
   console.error('[Oikos] Unbehandeltes Promise-Rejection:', e.reason);
-  const msg = e.reason?.message || 'Ein Fehler ist aufgetreten.';
+  const msg = e.reason?.message || t('common.errorGeneric');
   showToast(msg, 'danger');
   e.preventDefault(); // Konsolenfehler unterdrücken (bereits geloggt)
 });
@@ -395,11 +396,7 @@ if ('serviceWorker' in navigator) {
     if (e.data?.type === 'SW_UPDATED') {
       // Modul-Cache leeren damit nächste Navigation frische Module lädt
       moduleCache.clear();
-      showToast(
-        'Update verfügbar — Seite neu laden für die neueste Version.',
-        'default',
-        8000
-      );
+      showToast(t('common.updateAvailable'), 'default', 8000);
     }
   });
 }
@@ -415,6 +412,38 @@ window.addEventListener('auth:expired', () => {
   navigate('/login');
 });
 
+// Sprache geändert: Navigation neu rendern damit Labels aktualisiert werden
+window.addEventListener('locale-changed', () => {
+  const navSidebarItems = document.querySelector('.nav-sidebar__items');
+  const navBottomPages  = document.querySelectorAll('.nav-bottom__page');
+  const skipLink        = document.querySelector('.sr-only[href="#page-content"]');
+  const navSidebar      = document.querySelector('.nav-sidebar');
+  const navBottom       = document.querySelector('.nav-bottom');
+
+  if (skipLink)  skipLink.textContent = t('common.skipToContent');
+  if (navSidebar) navSidebar.setAttribute('aria-label', t('nav.main'));
+  if (navBottom)  navBottom.setAttribute('aria-label', t('nav.navigation'));
+
+  if (navSidebarItems) {
+    navSidebarItems.innerHTML = navItems().map(navItemHtml).join('');
+  }
+  if (navBottomPages.length >= 2) {
+    navBottomPages[0].innerHTML = navItems().slice(0, 5).map(navItemHtml).join('');
+    navBottomPages[1].innerHTML = navItems().slice(5).map(navItemHtml).join('');
+  }
+
+  // Klick-Handler für neu gerenderte Nav-Links
+  document.querySelectorAll('[data-route]').forEach((el) => {
+    el.addEventListener('click', (e) => {
+      e.preventDefault();
+      navigate(el.dataset.route);
+    });
+  });
+
+  // Aktiven Zustand und Icons wiederherstellen
+  updateNav(currentPath);
+});
+
 // --------------------------------------------------------
 // Virtuelle Tastatur: FAB ausblenden wenn Keyboard offen
 // Erkennung via visualViewport — Höhe < 75% des Fensters = Keyboard aktiv.
@@ -430,7 +459,10 @@ if (window.visualViewport) {
 // --------------------------------------------------------
 // Initialisierung
 // --------------------------------------------------------
-navigate(location.pathname, false);
+(async () => {
+  await initI18n();
+  navigate(location.pathname, false);
+})();
 
 // Globale Exporte
 window.oikos = {
diff --git a/test-browser-loader.mjs b/test-browser-loader.mjs
new file mode 100644
index 0000000..c373a18
--- /dev/null
+++ b/test-browser-loader.mjs
@@ -0,0 +1,29 @@
+/**
+ * test-browser-loader.mjs — Node.js Custom Loader für Tests
+ * Zweck: Browser-absolute Pfade (/foo.js) auf Stubs umleiten, damit
+ *        Frontend-Module im Node-Test-Kontext importierbar sind.
+ * Verwendung: node --loader ./test-browser-loader.mjs test-xxx.js
+ * Dependencies: none
+ */
+
+const STUBS = {
+  '/i18n.js': `
+    export const t = (key) => key;
+    export const initI18n = async () => {};
+    export const setLocale = async () => {};
+    export const getLocale = () => 'de';
+    export const getSupportedLocales = () => ['de', 'en'];
+    export const formatDate = (d) => String(d);
+    export const formatTime = (d) => String(d);
+  `,
+};
+
+export async function resolve(specifier, context, nextResolve) {
+  if (STUBS[specifier]) {
+    return {
+      shortCircuit: true,
+      url: `data:text/javascript,${encodeURIComponent(STUBS[specifier])}`,
+    };
+  }
+  return nextResolve(specifier, context);
+}
diff --git a/test-modal-utils.js b/test-modal-utils.js
index 898c86c..79ab0b1 100644
--- a/test-modal-utils.js
+++ b/test-modal-utils.js
@@ -7,6 +7,7 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 
+// /i18n.js wird durch test-browser-loader.mjs gemockt (--loader Flag)
 const { wireBlurValidation, btnSuccess, btnError } = await import('./public/components/modal.js');
 
 const _origSetTimeout = setTimeout;