I personally don't use PBX, but if it's anything like GameEx, you have to set the language to "Custom" for the language changes.
If that's not the case, I didn't say anything...
In Settings Wizard you can go to the Text screen and clear all the fields. Then it should say "Featuring 57".
If for whatever reason, this isn't working then you can edit config.ini directly in Notepad or any other text editor.