3b5ca04ebc
- Add LocaleProvider + useLocale() hook with AsyncStorage persistence to mobile i18n - Replace all hardcoded English strings in every screen with t() calls - Add missing profile.settings/language keys to all 5 translation files (en/de/es/fr/it) - Wrap app root in LocaleProvider; apply server preferred_language on login in AuthGuard - Tab labels and header titles now re-render on language switch - ProfileScreen: use useLocale() context, sync language to server via POST /api/i18n/language - Backend: add preferred_language field to GET /api/mobile/whoami response - Mobile API: add preferred_language to WhoAmIResponse type + setServerLanguage() method - Tests: add test_whoami_returns_preferred_language and test_whoami_no_profile_preferred_language_is_null - Docs: update MobileApp.md with language sync priority and whoami response format Language priority: server preference > AsyncStorage > device locale > English fallback Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>