Revisions improvements

* Corrected routing behavior
* Simplified CSS for tooltips
* Compare two mode for RTL
* Support for posts without titles 

props adamsilverstein, ocean90. see #24425.

git-svn-id: https://core.svn.wordpress.org/trunk@24578 1a063a9b-81f0-0310-95a4-ce76da25c4cd