feat(vocab): implement user vocab lesson progress reset functionality

- Added `resetUserVocabLessonProgress` method in `AdminController` to allow admins to reset a user's progress for a specific vocab lesson.
- Introduced corresponding route in `adminRouter` for the new reset functionality.
- Enhanced `VocabService` with methods to purge lesson progress for users, ensuring that only the specified lesson's progress is affected.
- Updated UI components in `UsersView` to facilitate the selection of courses and lessons for resetting progress, including confirmation dialogs and loading states.
- Added localization support for the new reset functionality across multiple languages.
- Implemented reset functionality in `VocabLessonView` for users to reset their own lesson progress.

backend/routers/adminRouter.js

@@ -25,6 +25,7 @@ router.put('/users/:id/adult-verification', authenticate, adminController.setAdu
 router.get('/users/erotic-moderation', authenticate, adminController.getEroticModerationReports);
 router.get('/users/erotic-moderation/preview/:type/:targetId', authenticate, adminController.getEroticModerationPreview);
 router.put('/users/erotic-moderation/:id', authenticate, adminController.applyEroticModerationAction);
+router.post('/users/:id/vocab-lesson-progress/reset', authenticate, adminController.resetUserVocabLessonProgress);
 router.get('/users/:id', authenticate, adminController.getUser);
 router.put('/users/:id', authenticate, adminController.updateUser);