Can also mean (with capitalised "Sie") "Are you learning German?"
"Do they learn German?" is one of the accepted answers for a translation exercise for this sentence.
Did you get a listening exercise?
Then I don't know what might have gone wrong.
The next time this happens, perhaps you could make a screenshot and upload it somewhere, then link to it in a comment so that I can see what you saw?
I have a translation exercices and on 04.01.2019 " Do they learn german" is not accepted.
Yes. Not only is “German” spelled wrong (you used a small g); it’s also not a correct translation of the German sentence. Lowercase sie cannot mean “you”.
(The polite “you” is Sie — always uppercase.)