Add translation variables for quick export and master image filename in

musdb

backend/tr/image_incha.json

@@ -54,7 +54,9 @@
         "updated_annotation_translation": "Updated annotation translation",
         "deleted_annotation_translation": "Deleted annotation translation",
         "global_max_file_uploads": "Overall, the maximum number of images that can be uploaded in one go is",
-        "image_upload_page_title": "Image upload form"
+        "image_upload_page_title": "Image upload form",
+        "master_filename": "Name of master file",
+        "master_filename_explica": "The name of the masterfile including the file extension but without the filepath"
     },
     "incha_image": {
         "front": "Vorderseite",