At first I got the standard replay:
"I'm afraid that our current deals with publishers usually only allow us to release those language versions which are currently available. We do our best to get localized versions whenever possible, but it's not always easy. Whenever possible, we add additional language versions to current releases as well."
To which I replied with the information Michael Rüve gave on the wop-forums.
"We are currently investigating this issue."
And yesterday evening, finally:
"We are currently working on adding those German versions, however I am not able to predict when will they be ready."
YESSSSS!!! :D good old GOG! <3