Was ist der Unterschied zwischen "auf Deutsch" und "in Deutsch"?

Question

Answer

Nowadays they are mostly used interchangeably: "Der Brief ist in/auf Deutsch geschrieben."
But you'd use "auf" in a sentence like this:
Was heißt "carpet" auf Deutsch? - Teppich. (What's "carpet" in German? - Teppich.)
And you'd always have to use "in" when you're talking about the school subject:
In Deutsch habe ich immer gute Noten. (I always get good grades in German)

Answer

http://bastiansick.de/kolumnen/zwiebelfisch/ist-in-deutsch-genauso-gut-wie-auf-deutsch/
http://german.stackexchange.com/questions/1748/wann-kann-man-in-deutsch-und-wann-auf-deutsch-verwenden

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