Merge pull request #1608 from xillibit/k30_bugs16

J 2.5: It is missing the language string #1597
#1602 Crypsis - frontend category manager: Checkbox all doesn't work
Remove unused cssmin class
Fix manifest doctype in Blue Eagle and Crypsis
Frontend: Fix a few potential undefined variable bugs
Merge pull request #1609 from xillibit/k30_bugs11

#1602 Crypsis - frontend category manager: Checkbox all doesn't work
Merge pull request #1611 from xillibit/k30_bugs16

Crypsis : little tweak on announcement list template
Fix potential undefined variable bugs in plugins
Installer: fix broken error handling
Installer: fix undefined variables, improve code docs
Admin Tools: fix IP cleanup (day limit not working)
Report Configuration: fix a bug in integration settings
Improve library documentation, fix some potential bugs
Improve code documentation, fix some potential bugs
Admin templates: on each file define $this in doc block
Merge branch 'master' of github.com:Kunena/Kunena-2.0
Installer: clear cache before custom installer (#1595)
K3.0/J3.0/J2.5 Backend: Added some new filter strings and shorten some strings.
K3.0/J3.0/J2.5 Backend: Added new override for Wells, Buttons, and Text in Tables.
K3.0/J3.0/J2.5 Backend: New Filter State, Code Cleanup, Layout Cleanup, Bugfixes.