Do you guys have any advice on finding random games that haven't been translated yet?
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It's just like it says in your link: it's just a graphics hack. You would change the font the same way you would change any other graphic in the game – if the font graphics are compressed, then you'll have to decompress them and re-compress them, just like any other graphic in the game.
In the case of Link to the Past, I expect the ROM has been thoroughly documented and there should surely be some information out there about editing the graphics.