English is the working language of software development, so it does make a degree of sense to bemoan the fact that the API documentation is only available in German.
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.
This is not true at all. There's plenty of code written with comments relevant to the country in question. It's not for you to decide what other developers should make their working language. I'd like to see you go to China and ask them all to stop commenting their code in Mandarin.
Not really in Germany. Lots of documentation is German only, in some german games (most notably the Anno series) even the scripting languages’ keywords were German ("wenn" instead of "if", "solange" instead of "while", etc).
And even in huge codebases such as SAP, most comments are still German.
Yes, modern codebases are often written in english, but that’s not everywhere.
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.