Allow for modification of button text in intro & ending screens (branching scenario)

In the branching scenario, I’d like to be able to customize the interactive button text on the start and end screens from the authoring tool (vs having the know code).  Unless I missed it in the settings?  So, instead of “Start the Course,” I’d like to modify it as I might want this to be presented as something other than a course, like maybe for a game (e.g. “Enter the door”).  Same for the end scenario screen (modify “Restart the course” text).  Just having the default text say “Start” and “Restart” would be great if user modification isn’t an option.