Re-do question was a new optional feature added in Moodle 2.9.
But for some reason, I put the button in the info box, which is just stupid, particularly in some other languages. (Thanks to Alain Benoit at MDL-52814 for that screen-grab. I like the image in the feedback!)
It would clearly be better to put the button in the feedback in the Yellow feedback box:
Well, I think that is clearly better. This is your chance to point out if I am wrong.
(Sadly, I think the rules of the Moodle development game mean that this sort of change can only go into Moodle 3.1.)