Langauge not changing after 3.5 update

Hi! I updated Pro Sites to the latest 3.5 version, but after the update the language does not change to my own uploaded language file. It is the same file as before, with the same name, but it won't work as it did before.

The files are psts-da_DK.po and psts-da_DK.mo and are placed in the language folder.