(1989) is actually a French television movie directed by Serge Moati, rather than a standalone musical work typical of the IMSLP (International Music Score Library Project)
The keyword l%27%C3%A9t%C3%A9 de tous les chagrins imslp is a URL-encoded string. Decoded, it reads: l%27%C3%A9t%C3%A9 de tous les chagrins imslp
"L'été de tous les chagrins" could refer to a composition by a various artists or composers. Without a specific composer in mind, it's difficult to provide detailed information. (1989) is actually a French television movie directed
Childhood innocence, loss, exile, and the historical tension of the Pieds-Noirs experience. Director: Serge Moati. Childhood innocence, loss, exile, and the historical tension
A famous work with a similar emotional arc is (afternoon, not summer) or "Les Nuits d'été" by Hector Berlioz (summer nights, not all sorrows). Berlioz's Les Nuits d'été Op. 7 is a song cycle about love and loss, but its songs include "Villanelle" (cheerful), "Le Spectre de la rose" (bittersweet), and "Absence" (true sorrow). No single song is called "L'Été de tous les chagrins."