In your admin control panel, go to: Appearance > Languages > click "Import a Language" > Choose file > Import as "No Parent" > check "Overwrite language" > choose "Nederlands" > click "Import".
Done.
If you also would like to change the date format so no words are used in the date you can do that by going to
APC - Options - AVForums.com - Competitions Options
and change Date Format to
Done.
If you also would like to change the date format so no words are used in the date you can do that by going to
APC - Options - AVForums.com - Competitions Options
and change Date Format to