I agree there is often a lot more nuance, but I don't entirely agree that the entire concept doesn't exist. For example there is no word for "sibling" in Dutch,

I agree there is often a lot more nuance, but I don't entirely agree that the entire concept doesn't exist. For example there is no word for "sibling" in Dutch, and some of the entries on that list such as "koukleum" (person who quickly feels cold) don't really have good translations to English. It's not "untranslatable" in the strict sense (I just translated it here), but there is no analogous word and it's "untranslatable" in the colloquial sense. Either way, I think a site like this could be a really interesting, if it was written well, with appropriate context and nuance. I would also choose a very different list (I drafted an article for this years ago, and it has 0% overlap).