fix: add missing i18n keys across all non-German locales (#83)

* fix: add missing i18n keys for nav, search, tasks, calendar, settings, reminders in all locales

Resolves #82

nav.more, calendar.ics.reset/resetToast, settings.ics.*, tasks.filter*,
tasks.swiped*, search.* and reminders.* keys were missing in all 14
non-German locale files, causing the app to fall back to German strings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* chore: release v0.23.15

---------

Co-authored-by: Ulas Kalayci <ulas.kalayci@googlemail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "oikos",
-  "version": "0.23.14",
+  "version": "0.23.15",
   "description": "Self-hosted family planner - calendar, tasks, shopping, meal planning, budget and more. Private, open-source, no subscription.",
   "main": "server/index.js",
   "type": "module",