Remove live update language files after merge
#1440 Thankyou limit: If the limit is reached, the button not disappears
Installer: Start using modal instead of redirect
Merge pull request #1442 from xillibit/k30_bugs5

#1440 Thankyou limit: If the limit is reached, the button not disappears
Fix #1443 Fatal Error: JUser::getType
#1437 K 3.0 Backend Prune function gives an SQL error
Merge pull request #1445 from xillibit/28d5afc63de6581c35cf3abb10a6532847b1c7c9

#1443 Fatal Error: JUser::getType
Merge pull request #1446 from xillibit/k30_bugs8

#1437 K 3.0 Backend Prune function gives an SQL error
Merge remote branch 'upstream/master' into k30_installer