mozMobileConnections buchet (bug 948037)

close #346
L10n Extract/compile script. Today's lucky number is 21578.
Fix upsell icon
GA variables are all string
check for app object's existence before trying to track it
unfloat right side of content ratings on desktop (bug 960402)
Merge pull request #354 from ngokevin/iarcunfloat

unfloat right side of content ratings on desktop (bug 960402)