Need help with editing a Title Screen in Guilty Gear 2X for PC

I am working on a little project Im calling Guilty Gear 2X #ReMIX! on the PC version of Guilty Gear 2X #Reload. So far everything else has been going great however I want to Edit the Title screen of the game and Change #Reload to #ReMIX and add mg tag under that. However I have no idea which file is the title screen and what program I can use to edit. (I would assume Photoshop)

Can anyone give me some pointers?