To anyone who's still interested, i made a partially translated eboot for the JP version, this translates most menu stuff, all skill names (only some of the descriptions), item names and descriptions (only usable items, didn't translate materials and equipment) and some other stuff.
just use this along with the Map0R.cpk and Map1R.cpk files from the US version and you should be able to get through the game just fine.
Also, what do you mean? do you mean those big buttons that show up there when you open the menu? those can't be translated since they're not text, but textures, and they're inside the rootR.cpk.
Do you guys have the main story of the game translated or only the menu? If that is the case i am on a quest to find out if the Story and NPC dialogue can be ported over without the need to manually translate the game word for word.