[FIX] restoring custom.css for themes

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52758 b456876b-0849-0410-b77d-98878d47e9d5
[FIX][bp/r52759] Typo

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52760 b456876b-0849-0410-b77d-98878d47e9d5