Complex sentence: The film's title may be intended as a reference to the song "La Vie en rose" where being "en rose" (in pink) means being in love; in the film it refers to Ludovic's female-gender identity.
Split into simpler sentences: The film's title may be intended as a reference to the famous chanson "La vie en rose". In the song, being "en rose" (in pink) means being in love, but in the film it refers to Ludovic's female gender identity.