I downloaded Firefox from the U.S. site, precisely for worry of getting stuck with the wrong language version.
True, I'm currently in Germany, but your locality detection fails to consider the fact that there are people in Germany that are NOT german!
I've looked through the options, and there's no place to alter the language of the user interface!
My computer is set to English, the locality of my computer is set to U.S. but all to no avail.
Very frustrating
Basically, users should be asked at install what language they want...
Is there any workaround?