[MOD]Fix consistency with icon size. Add '12' to the congratulations message about the Tiki instance so that it can be applicable for upgrades also. Add more spacing between the two first lines.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49071 b456876b-0849-0410-b77d-98878d47e9d5