Thanks, Bert - don't have time for a full translation, but here's a general idea:
chorus: Don't be angry, it simply cannot be
Don't be angry, and (something like) send yourself inside.
Don't be angry, and don't make a face
But, God help you, don't forget my face.

So, anyhow, the female miller led the fisherman on, so he knocked on her door and asked her to be his one-and-only, and she replied with the "Don't Be Angry" song.

So she went off proudly into the world, but came back not-so-proudly, and went to the fisherman and asked him to trust her and be her one-and-only, and now he sings the same "Don't Be Angry" song.

And that, my friend, is what is known as the "loose" translation. Cute song, ain't it?
-Joe Offer-