Show translations of the labels of the tab-buttons in the credits gui page.
Mistake introduced in rP17830, made apparent in rP17904, and not caught in rP18281.
Reported by: thekolian1996 (forums)
Reviewed By: elexis
Differential Revision: https://code.wildfiregames.com/D1695
Hmm. Made mistake in commit message. r17904 did not have anything to do with this.