[MOD] rename tooltip to match new name Settings pages

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@53330 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] modify two icons to use icon set

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@53331 b456876b-0849-0410-b77d-98878d47e9d5