feat: add Danish locale

README.md

@@ -67,7 +67,7 @@ The goal is a single, private place for everything that keeps a household runnin
 - **PWA** — installable on any device, works offline, dark mode, responsive from phone to desktop
 - **Privacy First** — SQLCipher AES-256 encrypted database, fully self-hosted, zero telemetry
 - **Zero Build Step** — pure ES modules, no bundler, no transpiler, no framework
-- **Multilingual** — 16 languages with automatic locale detection (de, en, es, fr, it, sv, el, ru, tr, zh, ja, ar, hi, pt, uk, pl)
+- **Multilingual** — 17 languages with automatic locale detection (de, en, es, fr, it, sv, da, el, ru, tr, zh, ja, ar, hi, pt, uk, pl)
 
 ## Quick Start
 

TRANSLATION_DA_NOTES.md

@@ -0,0 +1,16 @@
+# Danish translation notes
+
+No blocking translation issues found.
+
+A few terms involved product-style judgment calls:
+
+- `notes.title` / `nav.notes` → **"Tavle"** to match the family-planner/board feel better than a literal "Noter".
+- `housekeeping.title` → **"Rengøringsområde"** while navigation keeps **"Rengøring"** for shorter UI labels.
+- `dashboard.title` / `nav.dashboard` → **"Oversigt"** to stay natural in Danish UI copy.
+- Existing non-English source strings inside `en.json` (mainly a few German settings labels) were translated into Danish from their apparent UI meaning.
+
+Verified:
+
+- `public/locales/da.json` parses as valid JSON.
+- `da.json` matches `en.json` key structure exactly.
+- Placeholder tokens such as `{{name}}`, `{{count}}`, `{{date}}`, and `{{title}}` were preserved exactly.

docs/SPEC.md

@@ -791,7 +791,7 @@ All UI strings are managed via `public/i18n.js`. No hardcoded text in JS files o
 ### Architecture
 
 - **Module:** `public/i18n.js` - exports: `initI18n()`, `setLocale()`, `t(key, params?)`, `getLocale()`, `getSupportedLocales()`, `formatDate(date)`, `formatTime(date)`
-- **Locale files:** `public/locales/de.json` (reference), `public/locales/en.json`, `public/locales/es.json`, `public/locales/fr.json`, `public/locales/it.json`, `public/locales/sv.json`, `public/locales/el.json`, `public/locales/ru.json`, `public/locales/tr.json`, `public/locales/zh.json`, `public/locales/ja.json`, `public/locales/ar.json`, `public/locales/hi.json`, `public/locales/pt.json`, `public/locales/uk.json`, `public/locales/pl.json` - structure: `{ "module.camelCaseKey": "Value" }`
+- **Locale files:** `public/locales/de.json` (reference), `public/locales/en.json`, `public/locales/es.json`, `public/locales/fr.json`, `public/locales/it.json`, `public/locales/sv.json`, `public/locales/da.json`, `public/locales/el.json`, `public/locales/ru.json`, `public/locales/tr.json`, `public/locales/zh.json`, `public/locales/ja.json`, `public/locales/ar.json`, `public/locales/hi.json`, `public/locales/pt.json`, `public/locales/uk.json`, `public/locales/pl.json` - structure: `{ "module.camelCaseKey": "Value" }`
 - **Variables:** `{{variable}}` syntax in translation strings, e.g. `t('tasks.assignedTo', { name: 'Anna' })`
 - **Fallback chain:** active locale → German (`de`) → key itself
 - **Date format:** `Intl.DateTimeFormat` with current locale - use `formatDate()` and `formatTime()` from `i18n.js`

public/components/oikos-locale-picker.js

@@ -14,6 +14,7 @@ const LOCALE_LABELS = {
   fr: 'Français',
   it: 'Italiano',
   sv: 'Svenska',
+  da: 'Dansk',
   el: 'Ελληνικά',
   ru: 'Русский',
   tr: 'Türkçe',

public/i18n.js

@@ -5,7 +5,7 @@
  * Dependencies: none (vanilla JS, Fetch API, Intl API)
  */
 
-const SUPPORTED_LOCALES = ['de', 'en', 'es', 'fr', 'it', 'sv', 'el', 'ru', 'tr', 'zh', 'ja', 'ar', 'hi', 'pt', 'uk', 'pl'];
+const SUPPORTED_LOCALES = ['de', 'en', 'es', 'fr', 'it', 'sv', 'da', 'el', 'ru', 'tr', 'zh', 'ja', 'ar', 'hi', 'pt', 'uk', 'pl'];
 const DEFAULT_LOCALE = 'de';
 const STORAGE_KEY = 'oikos-locale';
 const DATE_FORMAT_KEY = 'oikos-date-format';

public/sw.js

@@ -15,7 +15,7 @@
 
 const SHELL_CACHE   = 'oikos-shell-v72';
 const PAGES_CACHE   = 'oikos-pages-v67';
-const LOCALES_CACHE = 'oikos-locales-v16';
+const LOCALES_CACHE = 'oikos-locales-v17';
 const ASSETS_CACHE  = 'oikos-assets-v67';
 const BYPASS_CACHE  = 'oikos-bypass-flag';
 const ALL_CACHES    = [SHELL_CACHE, PAGES_CACHE, LOCALES_CACHE, ASSETS_CACHE];
@@ -64,6 +64,7 @@ const APP_SHELL = [
 
 const APP_LOCALES = [
   '/locales/ar.json',
+  '/locales/da.json',
   '/locales/de.json',
   '/locales/el.json',
   '/locales/en.json',