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.

frontend/src/views/social/VocabCourseView.vue

@@ -16,6 +16,9 @@
         <span v-if="course.shareCode && isOwner" class="share-code">
           {{ $t('socialnetwork.vocab.courses.shareCode') }}: <code>{{ course.shareCode }}</code>
         </span>
+        <button type="button" class="course-dictionary-link" @click="goCourseDictionary">
+          {{ $t('socialnetwork.vocab.dictionary.open') }}
+        </button>
       </div>
 
       <section class="surface-card course-assistant">
@@ -691,6 +694,9 @@ export default {
         showApiError(this, e, this.$t('socialnetwork.vocab.courses.deleteLessonError'));
       }
     },
+    goCourseDictionary() {
+      this.$router.push(`/socialnetwork/vocab/courses/${this.courseId}/dictionary`);
+    },
     openLesson(lessonId) {
       this.$router.push(`/socialnetwork/vocab/courses/${this.courseId}/lessons/${lessonId}`);
     },
@@ -826,6 +832,11 @@ export default {
   color: #666;
   flex-wrap: wrap;
   padding: 16px 18px;
+  align-items: center;
+}
+
+.course-dictionary-link {
+  margin-left: auto;
 }
 
 .course-assistant {