There's nothing to be fixed in GSX, just read the CLS manual, and you'll see the "2R door (Galley Door)", that GSX calls in that way, exactly as the CLS calls it, so you can't possibly misunderstand which door is referring to (in the context of the airplane used), will open with a command on the upper right of overhead panel.
That's not of course a GSX specific or a GSX issue: that's the way the CLS330/340 opens that door, and GSX obviously complies.