"Duo is generous."
It is much more difficult to find exact equivalents of adjectives across languages. "Ramadan Kareem" as a greeting has a slightly different meaning than describing someone as "kareem".
Note: This one رمضان كريم: https://forum.duolingo.com/comment/38603718 is a community topic unrelated to the exercise. Means if you press the chat button from the exercise, you'll go to the above 39006923 link therefore please keep the learning discussion there.
Duo: You ARE generous on the computer!!! But not on the phone app!!! Let's work on changing that! (Examples: got one question left when you run out of hearts...and you're ready to call it quits after this, so you don't want to buy four or five more hearts! Another example--you can't imagine how frustrating it is to lose hearts-let alone your LAST heart-because of, not even a typo! but because, Autocorrect came behind you and changed your answer!!! I kid you not, at least half of my lost hearts are due to Autocorrect!) But Duo, I love you anyway!!