This Dr. Horrible's Sing-A-Long Blog screencap contains
living room, living room, sitting room, front room, parlor, parlour, family room, and den.
There might also be
parlor, parlour, drawing room, and morning room.
A German fan has translated the first couple minutes of Act I. It's pretty well done I think. All German fans on this spot or everyone who is interested should have a look ; )