By JIM TANKERSLEY Just two weeks after the far-right Alternative for Germany party, or AfD, scored a stunning victory in the small eastern state of Saxony-Anhalt, German voters in two other regions voted Sunday and delivered a new gauge of the AfD’s national prospects. Voters in Berlin and in a lightly populated coastal corner of the former East Germany, Mecklenburg-West Pomerania, elected new state parliaments. Exit polls released after voting ended showed the AfD was on track to improve its…