I think the problem is solved. Your solution is invalidated. Please can you have a look?

Why that's an issue?
Do you have any suggestion on how to solve this?
(BTW this is a cheat, if you're going to use this extensively you'll get banned)

I fear it can no longer be changed, though...

I'm afraid you'll need to translate it yourself ;-)

There is a problem with Nim tests that is difficult to see.
Tests can be green with "Passed etc..." even if some fail.
Look if there is a small orange rectangle near "Tests results", in that case at least one test have failed. This small rectangle has to be green in order that you could submit.
I reported the bug at CW. Please see https://github.com/Codewars/codewars.com/issues/1087.
Complete this bug report by your observation. That could hopefully speed up a fix to that.
Sorry for the inconvenience.