Improved css for navigation
Changed text for links on the main page
Changed spacing of navigation entries
Improved mantis testserver problems link

Changed the link so the filter is set in a better way.
Changed the link on the homepage to hide all the nasty parameters.
Removed wrong handler from mantis filter link
Show count of mantis issues on main page
Added a ;
Replaced a ' with a "
Added missing static class reference
Fixed typo in english issue message
Improved testserver link appearance