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/controllers/adminController.js

@@ -33,6 +33,7 @@ class AdminController {
         this.getUser = this.getUser.bind(this);
         this.getUsers = this.getUsers.bind(this);
         this.updateUser = this.updateUser.bind(this);
+        this.resetUserVocabLessonProgress = this.resetUserVocabLessonProgress.bind(this);
         this.getAdultVerificationRequests = this.getAdultVerificationRequests.bind(this);
         this.setAdultVerificationStatus = this.setAdultVerificationStatus.bind(this);
         this.getAdultVerificationDocument = this.getAdultVerificationDocument.bind(this);
@@ -129,6 +130,25 @@ class AdminController {
         }
     }
 
+    async resetUserVocabLessonProgress(req, res) {
+        const schema = Joi.object({
+            lessonId: Joi.number().integer().positive().required()
+        });
+        const { error, value } = schema.validate(req.body || {});
+        if (error) {
+            return res.status(400).json({ error: error.details[0].message });
+        }
+        try {
+            const { userid: requester } = req.headers;
+            const { id } = req.params;
+            const result = await AdminService.adminResetUserVocabLessonProgress(requester, id, value.lessonId);
+            res.status(200).json(result);
+        } catch (err) {
+            const status = err.message === 'noaccess' ? 403 : (err.message === 'lessonnotfound' ? 404 : 500);
+            res.status(status).json({ error: err.message });
+        }
+    }
+
     async getAdultVerificationRequests(req, res) {
         try {
             const { userid: requester } = req.headers;

backend/controllers/vocabController.js

@@ -52,6 +52,7 @@ class VocabController {
     // Progress
     this.getCourseProgress = this._wrapWithUser((userId, req) => this.service.getCourseProgress(userId, req.params.courseId));
     this.updateLessonProgress = this._wrapWithUser((userId, req) => this.service.updateLessonProgress(userId, req.params.lessonId, req.body));
+    this.resetLessonProgress = this._wrapWithUser((userId, req) => this.service.resetMyLessonProgress(userId, req.params.lessonId));
     
     // Grammar Exercises
     this.getExerciseTypes = this._wrapWithUser((userId) => this.service.getExerciseTypes());