Add translation variable for transcript tab to basis for musdb

backend/hu/basis.json

@@ -103,6 +103,7 @@
         "room": "Szoba",
         "image": "K\u00e9pek",
         "menu_items": "F\u0151men\u0171 elemei",
-        "backgrounds": "H\u00e1tterek"
+        "backgrounds": "H\u00e1tterek",
+        "transcription": "Transcription"
     }
 }