if you have done the translation at a certified translation office, then the document is valid as it is. However, if it not done by a certified translator you would have to do it through them.
If it is by a certified translator, you go to the local standesamt and get the Beglaubigung/verification. If you tell in which city/town you need it, I can look it up and get you the right point of contact.
I hope we could assist you.