logs.cgi: Add files for showing firewall blocks by country

Add similair functionality as firewalllogip.dat and
firewalllogport.dat, by listing the number of blocks
per country, and provide a details link to show only
the blocked ip addresses from the country.

This is a preliminary prototype.
firewalllogcountry.dat: Use language strings and add to menu

Add some language strings for the new firewalllogport.dat, and
include html fixes done in firewalllogip.dat, which this file
is based on.

Also try to add the menu item to the sub menu, but that is
currently not working.