Updated mediawiki/extensions
Project: mediawiki/extensions/BetaFeatures  8355a56aa8336206c8f1096c555251f3a8719311

Fix pluralization (is/are)

Spotted by McDutchie
http://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Mw-ui-feature-requirements-browser/en

Change-Id: I440c1946819fcc5ad012a9c573028bf0411814ad