Thx, bruinfelix!
I’ve read a post about installing languages into the bb-includes/languages folder in in bbpress, but it simply doesn’t work for me. I think it was an older version (not 1.0 RC, which I currently use). In the RC your setting was the good solution. (“my-languages” folder). And of course the editing of define(‘BBLANG’, ”); in the config.php.
