LC_MESSAGES_MASK
loc = newlocale(LC_MESSAGES_MASK, "zz_AA.UTF-8", NULL);
loc = newlocale(LC_MESSAGES_MASK, "C", NULL);
{ LC_MESSAGES, LC_MESSAGES_MASK, "C.UTF-8" }
loc = newlocale(LC_MESSAGES_MASK, "ru_RU.UTF-8", loc);
loc = newlocale(LC_MESSAGES_MASK, "zz_AA.UTF-8", NULL);
loc = newlocale(LC_MESSAGES_MASK, "C", NULL);
loc = newlocale(LC_MESSAGES_MASK, "zz_AA.UTF-8", NULL);