So I've finally been able to get this translation working.
Mizzurna Falls was one of the first 3D open world games so it's quite unique in that regard, if a bit clunky.
It was made with Gemini’s source code, who made the hack and text injections, and Resident Evie’s translation of the text in the game. I just figured out how to compile it all and make it useable, and released it on romhacking. Justinarkinson tested the patch.
There are still some issues, so if someone wants to tackle them, there is a guide for getting started in the readme of the patch.
The most important ones seem to be the menus, that don't show text for the options. You can see that easily in the dinner, when Lorraine asks what do you want to eat.