My native language is german and I have (nearly) no problems with english documentation, but that is because I read english books on my own. But for my father, who has to read medical books in english for his job (and has nearly no problems with them) english computing books are too difficult. For him german documentation would be very good. For very young people (the 14 years old ones) it would be good, too.

But of the university students I think that they should learn to read english documentation, because there will be some day, where they won't get a german translation.