doppiej on "[Plugin: Theme My Login] Translations not working"

Something is going wrong with the translations.
When I am registering a new user and don't fill out anything at the passwords (user needs to fill out his password twice) the error shows in English and not translated.
I know the error is coming from the function 'password_errors' from 'custom-passwords.php'. It just doesn't translate the sentences.
Does anybody know why?

http://wordpress.org/plugins/theme-my-login/