Old message junk cleanup

Somehow this got added ages ago and went unnoticed.

conf/locale/locale_en-US.ini

@@ -1354,7 +1354,7 @@ raw_seconds = seconds
 raw_minutes = minutes
 
 [dropzone]
-default_message = Drop files here or click to upload.zz
+default_message = Drop files here or click to upload.
 invalid_input_type = You can't upload files of this type.
 file_too_big = File size ({{filesize}} MB) exceeds maximum size ({{maxFilesize}} MB).
 remove_file = Remove file