Ah, use reshacker on the RPG_RT.exe. A quick look through shows that the string is located at String Table/4079/0, lines 65254, 65255, and 65256. You'll probably get a complier error because Enterbrain are a bunch of doofuses and put an extra line - delete line 65264 and compile, (it's a duplicate anyway) then save it

(It's actually not as difficult as it sounds, resource hacking is pretty easy. Just keep in mind that anyone who plays your game has to use your version of RPG_RT.exe or they'll get the normal strings. If you need screenshots or something I'll do that for you)