Translation Updates:
- Added all missing translations for main interface elements
- Added translations for periods, declarations, and status messages
- Added success and error message translations
- Added French translations for all new keys
- Improved user experience with proper bilingual support
Main Interface Translations Added:
- DeclarationTVAMainInterface, DeclarationTVAPeriods, DeclarationTVADeclarations
- PeriodName, StartDate, EndDate, Status, Actions
- CreateDeclaration, DeclarationNumber, NetVATDue
- Validate, Submit, View buttons
- Status indicators (Draft, Validated, Submitted)
- Success/Error messages for all operations
The main interface is now fully translated in both English and French!