wikimedia/WikipediaMobile — pull request #275 by brion (2012-08-21 19:14:15+00:00)
Title: Fix Twitter detection on iOS 6; fix share dialog cancel button on iOS 4

Previous behavior checked only for iOS 5 and failed on 6, hiding the Twitter button.
Also, when Twitter button was hidden (eg on iOS 4 as well presumably) the cancel button triggered "Share via mail" whoops

https://bugzilla.wikimedia.org/show_bug.cgi?id=38226