i did eventually figure this out.
i extracted the romfs folder of an English CIA file of SMT IV and was able to get the Japanese cartridge translated using Luma's LayeredFS.
i'm expecting a few Japanese 3DS game cartridges for some games i have installed on my system in English. i have another 3DS system i would like to play these games on, hence the need for the cartridges to carry over my progress.
i was wondering if it would be possible to extract the English...
guys i just checked to see what's in the fortnite item shop today and saw that metallica skins, atla skins and jjk skins are in the item shop at the same time rn, shit's not real