open the custpack in notepad find these lines
<allowed-language>en</allowed-language>
<allowed-language>fr</allowed-language>
<allowed-language>de</allowed-language>
<allowed-language>tr</allowed-language>
<allowed-language>st</allowed-language>
<allowed-language>zu</allowed-language>
and then add in the danish language (i can't remember the code for danish)