Re: Custom registration fields?
Open it with PoEdit: http://www.poedit.net/download.php
Find the strings you need to change, for example, “Location” and translate them to what you need. Save the changes as a .po file (it will also create a .mo file). Copy both files to your bbpress directory into a folder called “my-languages”. If you don’t have such a folder, create it.
Change your bb-config.php file and you’re done.