PARIS — French film journo Charles Tesson is to take the reins at Cannes Film Festival’s Critics’ Week.Tesson, who was selected as general delegate by the French union of film critics, will begin his tenure early next year. He succeeds Jean-Christophe Berjon, who’s been in the post since 2004. A film critic and author, Tesson served as editor-in-chief of French film monthly magazine Les Cahiers du Cinema from 1998 to 2003, and remains a contributor. He has penned various books on leading auteurs, including Luis Bunuel, Akira Kurosawa and Abbas Kiarostami. Critics’ Week, which celebrates its 50th anniversary this year, has put a spotlight on many emerging directors who went on to have successful careers, notably Olivier Assayas and Guillermo Del Toro.