firewalllog*.cgi and country.cgi: Use language strings, and align graphs

Put the piechart for firewalllog* in the center of the page horisontally,
this looks visually better. Add language string for count and details
submit button.

Add language strings for country.cgi.
Make html validate for country.cgi.
Merge branch 'next' of https://github.com/ipfire/ipfire-2.x into feature_firewalllog_centergraph
Merge remote-tracking branch 'alfh/feature_firewalllog_centergraph' into next
Merge branch 'next' of ssh://git.ipfire.org/pub/git/ipfire-2.x into next
Merge branch 'next' of ssh://git.ipfire.org/pub/git/ipfire-2.x into next
openssh: Update to 6.6p1.
Firewall: extend DNAT dropdown with auto,BLUE,ORANGE,GREEN
Firewall: select right value in DNAT Dropdown