refactor: remove translation feature

Remove the translation feature including:
- Translation services (Smesh API and LibreTranslate)
- TranslationServiceProvider and context
- TranslateButton component
- Translation settings page
- useTranslatedEvent hook
- Translation-related types and i18n strings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/hooks/index.tsx

@@ -7,4 +7,3 @@ export * from './useFetchRelayInfos'
 export * from './useFetchRelayList'
 export * from './useInfiniteScroll'
 export * from './useSearchProfiles'
-export * from './useTranslatedEvent'