well I feel the same, but lets not forget that the OP didn't said anything about installing the fan translation when you read the install part so a few people make this kind of mistakes(at least I would if I hadn't asked before playing), that's why I don't blame them.
That's because it's not the op that did it, but Gadriel, the ops don't usually update stuff besides game updates. People have to ticket in things that could be helpful. Also there's instructions in that part of the post as well.
This literally links you to that post where the fan translation is, and it has detailed instructions on how to install the thing, like I can't even understand how there's confusion.
Had this whole back and forth between people on monster encyclopedia and people reporting having the same issue, the one where you need to run it with japanese locale.
A guy in the thread asking the op as you've mentioned doing here in a similar situation, to include instructions in the install section, guess what people still didn't read said section you're talking about on this other thread. Much like I told that guy, I said it's a good thing to suggest, but it's overall pointless, because people won't read it and will still ask, and much to my surprise (sarcasm),within less than a day, someone asked about the error again.
Tldr; I'm sorry man, you just can't fix laziness, ignorance of not knowing how to do basic things, and various other things.
Sorry for the long paragraph, needed to get a lot out in detail to fully give context.