feat(vocab): add language and course dictionary endpoints and UI components

- Implemented `getLanguageDictionary` and `getCourseDictionary` methods in the VocabService to retrieve vocabulary entries filtered by search terms.
- Updated VocabController and vocabRouter to include new routes for accessing language and course dictionaries.
- Enhanced frontend components to navigate to the new dictionary views, including buttons in VocabCourseView and VocabLanguageView.
- Added localization entries for the dictionary feature in multiple languages, ensuring a consistent user experience across the platform.

backend/routers/vocabRouter.js

@@ -20,6 +20,7 @@ router.get('/languages/:languageId/chapters', vocabController.listChapters);
 router.post('/languages/:languageId/chapters', vocabController.createChapter);
 router.get('/languages/:languageId/vocabs', vocabController.listLanguageVocabs);
 router.get('/languages/:languageId/search', vocabController.searchVocabs);
+router.get('/languages/:languageId/dictionary', vocabController.getLanguageDictionary);
 
 router.get('/chapters/:chapterId', vocabController.getChapter);
 router.get('/chapters/:chapterId/vocabs', vocabController.listChapterVocabs);
@@ -32,6 +33,7 @@ router.get('/courses', vocabController.getCourses);
 router.get('/courses/my', vocabController.getMyCourses);
 router.post('/courses/find-by-code', vocabController.getCourseByShareCode);
 router.get('/courses/:courseId/completed-lesson-vocabs', vocabController.getCompletedLessonVocabPool);
+router.get('/courses/:courseId/dictionary', vocabController.getCourseDictionary);
 router.get('/courses/:courseId/distractor-pool', vocabController.getVocabDistractorPool);
 router.get('/courses/:courseId', vocabController.getCourse);
 router.put('/courses/:courseId', vocabController.updateCourse);