Merge pull request #1626 from coder4life/master

K3.0/J3.0/J2.5 Backend: Small language tweak.
#1620 User search should match the used settings
Fix #1627: Category selection dropdowns in views are missing
Merge pull request #1628 from xillibit/k30_bugs16

#1620 User search should match the used settings
Fix #1630: Clean IP Addresses SQL error
Fix #1634: Duplicate language string in com_kunena.sys.ini
Fix #1618: Upgrade from 1.6.4 fails (after JUpgrade)
Merge pull request #1635 from mahagr/master

Fix #1627, #1630, #1634, #1618
Fix #1632 K3.0/J3.0/J2.5 Backend: Fix smilies delete not working.