Can you read the German language?
If so, I suggest to answer simply in English. Most people can read/understand that.
Try to use simple language for those who are not so familiar with the English language. (Not: 'Me Tarzan, you Jane' off course! :-))
For English is not my native language, I know how difficult it can be to explain things. Especially technical things.
It is easier to explain in your own language. Mostly people will understand what you mean if you do so.