Teacher-turned-indispensable-interpreter, Aida (Jasna Djuricic), runs around a crowded United Nations base relaying messages amid a humanitarian crisis on the brink of devolving into an unspeakable catastrophe. More importantly, she is a mother vehemently trying to wield whatever little influence she has to ensure her sons and husband survive, in Jasmila Zbanic’s “Quo Vadis, Aida?”