[germanier]

A significant amount of software development in Germany is done in German only, especially if you solve Germany-specific problems with your software (such as accessing banks). English far from being a general working language for software development here.

The software I use at work is developed by a German-speaking team based on German documentation. I think the code is mostly English although they often use German identifiers when there is no straightforward translation[0]. It's highly specific to the German legal environment and of absolutely no use abroad anyway. Translating everything twice just introduces more errors.