[REL] Preparing release

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/9.x@48222 b456876b-0849-0410-b77d-98878d47e9d5
[REL] Update README file for 9.7

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/9.x@48223 b456876b-0849-0410-b77d-98878d47e9d5
[REL] Update language.php files for 9.7

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/9.x@48224 b456876b-0849-0410-b77d-98878d47e9d5
[REL] Update changelog.txt for 9.7

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/9.x@48225 b456876b-0849-0410-b77d-98878d47e9d5