By Sophie Nellis   Belmondo and Seberg    The French New Wave – known as la nouvelle vague– was a celebration of youth, Paris and, above all, cinema. Many people don’t know that the term nouvelle vague was first used in 1957 to describe the new generation of French youth, emancipated 18 to 30 year olds who were free-thinking and keen to throw off the legacy of the Second World War. It was only following the success of François Truffaut’s Les...