Rename 'Client firewall' to 'System firewall'. Update translation template file.
Import/export firewall rules as XML files.
Import XML the FreeNAS style. Code taken from pfSense.
Modify navigation bar look (use slim instead of bold font).
Update translations.
Check if configured port is already used (e.g. UPnP, Bittorrent, DAAP, ...).
Rename option from 'Enable' to 'WebGUI'.
Translate missing texts.
Fix typo in config.xml
