[REL] Closing 12.0

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48855 b456876b-0849-0410-b77d-98878d47e9d5
[FIX]Usability: Only show 'More search options' in mobile when there are any of the extra search options available (there is none in blogs, for instance).
[ENH]Add some visual styling to the find general section, the 'More search options' subsection, and to the 'Go' button so that it's clearer what goes where.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48858 b456876b-0849-0410-b77d-98878d47e9d5