>>24831910>Then, I changed the language back to the original (Non Jap); restarted, changed it again to Japanese, restarted.This doesn't really involve language packs per say. When you click the circled, a prompt should pop up saying that you need to restart. Going through that process gets your system locale in Japanese.
If you did in fact do all of that, then sorry mate I've no idea. What's your OS?