If I try to respond to this comment, I get the language not allowed error:
https://kbin.social/m/games@lemmy.world/t/263669/-/comment/1189646
I checked my lemmy.world account settings through my web browser, and see that my language is set to Undetermined, which I thought was the fix for this.
I had same error when I tried to reply to kbin post from lemmy, seems like some compatibility issue?