I typed: My parents' marriage as a translation and I was told there was a typo. The answer given was: My parents marriage. This is wrong. There should be a possessive apostrophe after parents in the English translation.
After you answer a question, you should see a "Report" button on the bottom left.
Thank you. I have reported the error as described. There are only three tick boxes but I said there is a mistake in the dictionary hints so that's better than nothing.
There really ought to be a way to directly report issues like this, but, yeah, there's not. I usually write a note in the free response box. Those aren't as convenient for course contributors to deal with, but there isn't really any other way to clearly indicate what's amiss.