Inquiring as someone who does not converse Arabic: Googling هذه ليلة وألف ليلة provides me the guide "1001 nights" Subsequently. Is there a chance that what he sings is "This is certainly 1001 evenings"? Director Olivier Dahan came up with the idea for the film on 22 January 2004, https://worldsocialindex.com/story3757292/edith-piaf-la-vie-en-rose-can-be-fun-for-anyone