In the US, you can generally specify to your certified translators how you want proper names and place names written. I would suggest you or your friend talk to the translators again so that everything matches. It will also minimize future pains.

Also, USCIS usually has an "aliases" field on their forms, which would be a good place to put German government misspellings.

USCIS is a mess.

I know someone that still doesn't know whether they have a middle name as far as american authorities are concerned.

Coupled with "two last names" and it gets really messy, really quickly.

Purchases names don't match the CC name.

Bank statements are actually "for another person".

Border crossings are now extra spicy.

And "pray" that your name doesn't resemble a name in some blacklist.