Catch up with English versions:

firewall.7 rev 1.17 -> 1.18
ports.7 original revision number is corrected.
newsyslog.8 rev 1.38 -> 1.41
setpmac.8 rev 1.3 -> 1.4
sysinstall.8 rev 1.57 -> 1.58
vnode.9 rev 1.4 -> 1.5