[REL] Preparing 11.2 release

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@51077 b456876b-0849-0410-b77d-98878d47e9d5
[REL] Update README file for 11.2

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@51078 b456876b-0849-0410-b77d-98878d47e9d5
[REL] Update language.php files for 11.2

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@51079 b456876b-0849-0410-b77d-98878d47e9d5
[REL] Update changelog.txt for 11.2

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@51080 b456876b-0849-0410-b77d-98878d47e9d5