Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  8599f19a2d8b7dd271a9962a4032bdc751b3e772

Slightly rephrase message and add link

Suggested by Siebrand
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Echo-dismiss-prefs-message/nl

Change-Id: I600c3ab518dda019b3f4210c3836356908d2de91