(Credit: Brinkhoff/Mogenburg) Bartlett Sher’s “Rigoletto,” new this year at the Staatsoper Berlin, initially appeared an intriguingly localized production. Though a co-production with the Metropolitan Opera, its context and setting were uniquely Berlin. The opera’s action has been relocated to Weimar-era Germany, and the stage was dominated by the paintings of the Berlin-born painter George Grosz. The audience, as they filed {…}