Remove 2.9.x support form KunenaForum::isCompatible()
Add migration documentation
Add basic integration/detection documentation
Update Transifex configuration
Merge pull request #1758 from xillibit/k30_bugs16

#1757 Notice in Diagnostic tool with J! 3.1.1
Merge pull request #1762 from xillibit/k30_bugs16

#1757 Update template of diagnostics for Joomla 3.1
Merge pull request #1763 from mahagr/master

Remove 2.9.x support form KunenaForum::isCompatible(), docs update
#1757 Set language string for template for Joomla! 2.5