Are La Périchole and Jenůfa in the same language?
La Périchole:  Henri Meilhac and Ludovic Halévy wrote the French-language libretto based on the 1829 one act play "Le carrosse du Saint-Sacrement" by Prosper Mérimée, which was revived on 13 March 1850 at the Théâtre-Français. Jenůfa: Jenůfa    (Její pastorkyňa, "Her Stepdaughter" in Czech) is an opera in three acts by Leoš Janáček to a Czech libretto by the composer, based on the play "Její pastorkyňa" by Gabriela Preissová.
i don't know