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.

__________________
Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön

Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot