When Diane Kruger started acting, she had a firm rule about the roles she’d take. “I never wanted to be in a World War II movie,” Kruger says. “When I started out, I didn’t want to be pigeonholed as a German actress. It was such obvious casting for me.” Kruger has softened her stance, memorably playing a German film star who is an underground Allied agent in Quentin Tarantino’s alternate slice of history, “Inglourious Basterds.” “I got to help kill Hitler,” Kruger says. “That was not just great for me, but also for my country and the world.” Popular on Variety She returns to a World War II setting in “ Amrum ,” a historical drama about Nanning Bohm, a boy whose Nazi family is struggling to accept the collapse of the regime. The film, which opened this month in the U.S., reunites her with filmmaker Fatih Akin , who directed the 2017 thriller “In the Fade” that won Kruger the best actress prize at Cannes.…