Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  1d2d60137fe290354e88bc0584ad2bc9889b0088

Story 964: Move Echo to stable

Add is-authenticated class to body tag for logged in users
* Hide echo button when not logged in
** Drop the echo log in cta
* Customise Notifications special page for mobile to add a return to link
at top of page
* Move css to stable

Change-Id: Id5ea7a54546fa166fd3ee3d9bb22ca1ab725cffe