phsl / new-api

feat(i18n): add French pluralization support and complete translations

- Add pluralization rules for French locale using _one, _many, _other suffixes
- Complete missing French translations for web search, file search, and key count strings
- Add translations for import/export configuration functionality
- Fill in missing translations for UI elements like ID, IP, expand, and various status messages
- Improve French localization coverage for better user experience