Updated mediawiki/extensions
Project: mediawiki/extensions/PageDisqus  4437da383f68b3f9bf01749a0d707746c4c932a2

Consistency tweaks in preparation for adding extension to translatewiki.net

* Add newline at end of i18n file to unbreak translatewiki.net scripts
* Change extension credit type. Extension does not create a special page
* Remove "description" key, redundant with "descriptionmsg"

Change-Id: I8cfa36f7d53c1efbcb27ed48106a337f44a68847