Comment 10 for bug 42264

If I add "#, c-format" before

msgid "1 byte (1 B) copied"
msgid_plural "%<PRIuMAX> bytes (%s) copied"
msgstr[0] "1 octet (1 o) copié"
msgstr[1] "%<PRIuMAX> octets (%s) copiés"

it works...