WiethoofdScapegoat4resource/gamemenu.res - some buttons have images/parameters here. You should be able to make sense of itI've checked those files recently (today, even), but I've haven't been able to just change the text so say, "items" becomes "stash" or something similar.
Changing the text on the labels that are positioned in MainMenuOverride.res is done by changing 'Labeltext' in GameMenu.res, you will 'kill' localization and effectively hardcode the text that shows up.
I figured it out again before I saw this post, but thank you nonetheless