It is correct, or rather it was correct a few hundred years ago.
What you see is the "majestic plural" which was used to refer to a person in power during Medieval times. Somewhat fitting for the game. Makes you feel like a lord.
The translations would then be:
"Gebt einen Namen für das neue Profil ein:"
"Wollen Ihr das Profil '<<1>>' wirklich löschen?"
In recent years German is switching from Sie to Du among the younger demographic, or at least that's my impression.