ERR_INVALID_FMT
diag(gettext(ERR_INVALID_FMT), id_num, cur_po);
diag(gettext(ERR_INVALID_FMT), str_num, cur_po);
diag(gettext(ERR_INVALID_FMT), plural_num, cur_po);
diag(gettext(ERR_INVALID_FMT),