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
removed Undefined index: unknown in profile.php
removed Undefined index: lang_admin_common from loader.php
No need for bootstrap.js in the header when it is already in the footer
Adding admin_menu before message function.
adding generate_admin_menu('database'); to message functions in database.php
Merge pull request #231 from kierownik/master

removed Undefined index: unknown in profile.php
Merge branch 'master' into version2.0