Australia’s Foxtel has nabbed rights to “Supergirl” and “D.C.’s Legends of Tomorrow” for its Fox8 channel in a licensing pact with Warner Bros. Television. Fox8 already carries “Arrow” and “The Flash,” the D.C. Comics cousins of “Legends of Tomorrow.” “Supergirl,” another D.C. property that is bound for CBS this fall, is a natural fit with...