New weird language discovered in my dashboard settings

Hey everyone,

A weird language appeared in my "Default language" settings (in my network admin and for my users in their setting options).

My user have the choice between French, Englush, and a new language called "Bu".

Wether it's some aliens trying to communicate with us through my test website ^^, or I messed with something (could "bu" be related to "buddypress" ?).

I checked my "wp-content/languages" folder and here's what I have within :
https://dl.dropboxusercontent.com/u/5140132/wpmu/bu-language.png

Any idea of what I should remove to get rid of that "bu" language, or where to look at ?

Thanks a lot,
DJ

P.S : Let's hope the aliens are coming in peace ! :wink: