Add basic translations for linking articles in musdb's navigation

backend/iw/basis.json

@@ -105,6 +105,9 @@
         "menu_items": "Menu Items",
         "backgrounds": "Backgrounds",
         "transcription": "Transcription",
-        "record_language": "Language of record"
+        "record_language": "Language of record",
+        "article": "Article",
+        "articles_choose": "Select an article",
+        "articles_input": "Add an article"
     }
 }