Merge pull request #187 from ModernBB/version2.0

Merge version 2.0 with master
#191 Fix profile
#188 Fix "Board statistics" panel
#189 Remove old "About" information
#190 Add "Maintenance and security release" panel
Update backstage style
#196 Update announcement
Update language files
#197 Fix user profile settings interface
#207 Fix installation interface
#212 Fix search results
Update about
Tag ModernBB 2.0.1
#218 Quickjump cache is still generated
Merge branch 'version2.0' into version2.1
#219 Add new settingspage "Backstage settings"
Small updates
#219 Update database for support
#219 Fix bugs, add implementation for update
#210 Merge cache.php and cache_toolbar.php