You either have to edit the SYSCONF file (which is a binary file, so it's difficult), or you have to set a language override for each game by using game INIs as described here: https://forums.dolphin-emu.org/Thread-unofficial-howto-using-gameini-settings-per-game
It's harder than it should be, but this is how it is for now.
It's harder than it should be, but this is how it is for now.
