Translating hardcoded text in wp-signup

Hello everybody. I am totally new at WPMU and is starting a new site for a fishing community.

The "community" I am creating is not Buddypress enabled since that's a bit overkill for my use og af community.
Anyway........ My site will be in danish and I have found out that some text on wp-signup.php is hardcoded and I have started to translate it in the files. Now there's some text I can't find anywhere so I was hoping that someone could help me. I hope I am not the only one that needs this in another language than English.

The text I can't find is:

Blog Tagline:


In a few words, explain what this blog is about. Default will be used if left blank.

Thanks in advance.
Kind regards