Finished up the Danish translation.  

There's no ticket number for this change, but it is urgently needed nonetheless.

There are still a few strings I could not figure out how to translate.  I'm a gettext newbie and don't know how to deal with the names in [brackets].  Furthermore, I MAY have translated too much as there are some strings I think shouldn't be translated.  Finally, there are some date format strings (?) that I did not translate out of ignorance.