Andana Films has boarded worldwide sales on “ Detention ” (“La Détention”), Guillaume Massart’s second feature, ahead of its world premiere in the ACID sidebar at the Cannes Film Festival later this month. The French documentary is set inside the country’s prison officer academy, where the film observes trainees as their language, movements and certainties gradually align with the institution around them. Céline Loiseau of TS Productions produced. “We couldn’t have dreamed of a better premiere