Redoing a lot of the code to account for something different than Japanese is still not everything in most communities. I mean, documenting a game's formats is quite a feat of its own, especially when it involves complex archives, virtual file systems, compression(s), etc.
As for replacing the ugly BIOS font, those who can pull that kind of hack have my sympathy. I've done that more than a few of times: it's never easy or pleasant, especially when a game does weird stuff with VRAM and allocators. Mizzurna Falls gave me a few headaches just to figure out where I could add my texture loader, not to mention how to make the game not overwrite it because reasons.