Punkfrancais makes the quizzes without credit; see my quiz in French. I think because the fact that he featured our English quiz gives him the right to make it in French, am I correct?
I think as a standard, if someone is going to simply translate another person’s quiz then post it, then, at the minimum, a credit to the original author should appear on the translated quiz. I think the better idea again is what I did with a quiz of scambigol’s, which was to talk with him about it first, and from that we agreed to set up a joint username (scambiandJerry) and post the translations under that name. That takes a bit more effort, but at least it gives a fair reflection of the fact that a quiz really was the brainchild of two people who deserve equal billing and credit.