Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  7fc71555d9aeed3668c633eb6f42c6f7ecc0da3f

Whitelist 'useskin' and 'uselang' when choosing buttons to show

Fix related comment and typo.

Change-Id: I3e9d1e2e8cfcc9ed3d21617eccf2fae508251a49