download imgtools from megabyte.
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Then go to your 12sky2 folder to:
C:\AeriaGames\TwelveSky2\G03_GDATA\D01_GIMAGE2D\00 5\US\
There are the files for changeing names of items/mobs/npcs etc., see below.
005_00002: itemnames (drops, in inventory etc.) need hex editor
005_00003: trainer skills
005_00004 mob names, need hex editor
005_00006 Herb master content, npc names, need hex editor
005_00007: Quests
Use imgtools to convert the .img files to .hex files. And open them with a hex editor. Then go thru the entries and change them accordingly.
Lastly convert them back to .img files when you're done.
BEWARE: in the hex files, dont copy/paste, but copy/replace. Otherwise it doesnt work.
To change menu's, is a bit more iffy. As you will have to go thru each button and menu seperately, and modify the windows themselves with a photo editor.