Originally Posted by Baraka_Guru

Actually, it goes either way. I would capitalize both for German.

In my own usage (normally, Oxford), I capitalize all languages: English, French, German, etc., as I would nationalities.

Then there is "French braid" and "French bread," etc. But "french fries."

Then there is "german," which means having both parents the same: eg. "brother german."

It all comes down to usage/style, I suppose.

For the record, I would never use "english"; not even with "English muffin." And the same goes for "German" beyond the use of "german" in that other context.