One of the unlikeliest heroes to emerge from Zack Snyder’s horror-action flick Army of the Dead earlier this year was an oddball safecracker named Dieter. Part nerdy Eurotrash, part pretentious busybody, Dieter was never going to make it out alive. He was like one of those guys wearing a red shirt in Star Trek. Sooner or later, Dieter was gonna be gone. Well, that turns out to be dead wrong: Dieter has escaped — by way of the prequel, Army of Thieves, an improbable film starring this strange, fussy German creature who eats cheese and cucumber sandwiches and wears turtlenecks with suspender...