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https://imslp.org/wiki/Missa_de_R%C3%A9 ... es%C3%BAs)

This work title of this piece is in Spanish not in Latin, so the correct name is “Misa de Réquiem”.

Very wrong.
"If the title is the name of a standard, generic type or form of work (e.g. symphony, concerto, sonata, suite, string quartet, piano trio, nocturne), then English is preferred". From IMSLP Manual of Style, the which you should please read before uploading -anything-.