translation fixes

* XMLRPC: Special characters should be preserved, closes https://github.com/opnsense/core/issues/596
* XMLRPC sync only works if both systems have the same GUI port configured, closes https://github.com/opnsense/core/issues/125
* remove unreachable code

FreeBSD never implemented this.  OpenBSD did it differently and
more consequently: the `tos' tag of pf.conf(4) was properly extended
and their pf(4) can only be used to set the DSCP bit for symmetry
and general usefulness.  Until this comes back around to FreeBSD,
we'll leave it out.

translation fix for proxy page

Translation

o Order dependencies alphabetically in Makefile
o Use try/except so that failed lookup won't trash the script run

use netaddr to lookup mac address in list_arp.py and list_ndp.py

o Translate menu returned from API (glitchy, but why?)
o Fix styling in chrome by realigning the grouing
o Remove the button, enter is quicker
o Search indicator to the left
o Hide more menu entries
o Space around separator

(legacy) vpn_openvpn_client.php add duplicate option + some style fixes and cleanups. closes https://github.com/opnsense/core/issues/676