If you switch from one language to using English on musicbrainz.org, you will get this message:
"Language set. If you find any problems with the translation, please help us improve it!"

Either this message should not be shown for English, or it should be worded differently. E.g., suggesting to make a ticket if any English oddities are found.

Chatlog: http://chatlogs.metabrainz.org/brainzbot/musicbrainz/msg/3517437/