thnx! I’ve tried your tips and have deactivated comments for pages as well. (those were causing the most problems)
I have not recieved any errors since!
Do you mean how to do the translation via Poedit?
Just download the program and translate.
To create the .po file, this link might be of help?
You could use their tool to add the strings to an existing .po file.
Link: http://www.icanlocalize.com/tools/php_scanner