Translation:My child's teacher does not eat fish.
Here: http://en.pons.eu/translate?q=Kind&l=deen&in=ac_undefined&lf=en they write: Kind <-[e]s, -er>
[Okay, I give up trying to fix your link. There doesn't seem to be any way to get Duolingo's software to leave the ampersand alone.]
Oh, I see. In the heading of the NOUN entry. Thanks, AlexG38!
Even the official Duden accepts ‘Kinds’:
It's rather rare, though. Judging by Google hits, ‘Kindes’ is nearly 200 times more common.