[FIX] edit page: More fixes for full-screen modes, especially side-by-side translation. Still too much being done by javascript, should be more css but works better in more themes now (doesn't look great when loading, that could be improved sometime soon...)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48300 b456876b-0849-0410-b77d-98878d47e9d5