The text that QUI displays in all of its buttons, menus and dialogs can be customized by changing the appropriate resources.
To change a button or menu label, look for the labelString resources.
For example:
qui*main*commands*interrupt.labelString: Interrupt
qui*main*menuBar*load.labelString: Load...
qui*qui_window*yesNoProceed*okLabelString: Yes
To change the text of a message, look for the messageString
resources. For example:
qui*main*exitWarning*messageString: Do you really want to exit Prolog?