Add translation variable for transcript tab to basis for musdb

backend/tr/basis.json

@@ -103,6 +103,7 @@
         "room": "oda",
         "image": "resim",
         "menu_items": "men\u00fc \u00f6\u011feleri",
-        "backgrounds": "arka plan g\u00f6r\u00fcnt\u00fcleri"
+        "backgrounds": "arka plan g\u00f6r\u00fcnt\u00fcleri",
+        "transcription": "Transcription"
     }
 }