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/i18n/locales/ceb/socialnetwork.json

@@ -785,6 +785,19 @@
                 "search": "Pangita",
                 "noResults": "Walay results.",
                 "error": "Pangita failed."
+            },
+            "dictionary": {
+                "open": "Dictionary",
+                "kicker": "Tan-awa",
+                "intro": "Tanang termino gikan sa imong mga kapitulo. Usa ka field para sa partial match sa duha ka pinulongan.",
+                "searchLabel": "Pangita (duha ka pinulongan)",
+                "searchPlaceholder": "Part sa pulong sa bisan unsang pinulongan …",
+                "empty": "Walay entry.",
+                "loadError": "Dili ma-load ang dictionary.",
+                "notFound": "Walay access o wala makita.",
+                "languageTitle": "Dictionary: {name}",
+                "courseTitle": "Dictionary sa kurso: {name}",
+                "courseLearningColumn": "Pagkat-on nga pinulongan (kurso)"
             }
         }
     }