You should put region to "JPN".I am currently doing this for my friend now but I'm having problems getting the first step done. I downloaded the fates files through serene and I can't seem to get this done properly.
EDIT: So I opened up RomFS Builder.exe, ran the program > opened gen_romfs to get the file > put the file in the hans folder in SD > open the game and put the region to US and loaded up the game but it doesn't work.
EDIT AGAIN: I can't seem to load it up; it freezes up when loading. What am I doing wrong?
EDIT AGAIN AGAIN: So when I open the RomFS Builder.exe, I get the folder from rom in the translation folder right? Well that's what I did. One question though, I am patching this only for my friends Conquest ver.
The patch files include Birthright, as well. You're going to have to manually remove files that you don't need in order to get it to work.