'Save and Close' button while viewing completed contents changed to 'Done'?

When viewing already completed e-learning content, the top right option has changed from 'Save and Close' to 'Done'. This is claimed by one of our customers. While we are not exactly sure that this 'Done' button was there before or not, the user is extremely sure that earlier, even while viewing an already completed, it used to come as 'Save and Close'. Was the nomenclature of this button changed recently?

It would be of great help if somebody could provide clarity on this.