Correct phrasing of Attribution-ShareAlike

Per http://creativecommons.org/licenses/by-sa/3.0/. Spotted by Lokal
Profil and reported at
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Wikimedia-mobile-license-links/sv

Change-Id: I261ea8266622b02e1a9c32a6a28f8e28e2979611