RTL tweak for "All notifications" and "Preferences"

Some thanks to the following blog post
http://snook.ca/archives/html_and_css/background-position-x-y

Tested on Chrome and FF latest. Please test on more browsers!

Bug: 46215
Change-Id: I0b92b04f3a48dbd85c7e871a75a6973ea9760367
Merge "RTL tweak for "All notifications" and "Preferences""