To change your in-game language, open boot.cfg and change LOCALE to en_GB.
I’m assuming you use 0.6 or higher. These versions require XAMPP – download it from apachefriends.org. Then run it (make sure Skype is not running) and type “localhost/phpmyadmin” into your browser. Click “Import” and select the .sql file in the server folder. Press “OK”. Now it should work 🙂 .