Hello Kreufuss!
Nathanael mentioned you had been trying to contact me, and I'm sorry I missed your original messages. So much gets tagged as spam nowadays.
I would be perfectly happy for you to translate Streets of Marienburg. However, I was thinking of revising it (primarily to avoid the potential wrath of Games Workshop). If you are willing to wait a week for me to put together a new version, then you would be most welcome to take it from there.