HelloKids theme are using the “Arnold” font witch does not contain special danish fonts.
What I did:
downloaded the font I liked from dafont.com
converted it to cufon using the cufon converter (found by google). gave it fontfamily “Arnold”
found the arnold file in your project and replaced it with the new file. giving it the same name as the old Arnold file.
Not the prettiest way. but it worked.
be warned that you need to save your files in UTF-8, else you loose the ÆØÅ to ASCII rules.