Updated mediawiki/extensions
Project: mediawiki/extensions/TwnMainPage  dedfd6fd24b146e06e1f9e243b044cdc921baf0a

Add a language selector when the main page language is the source language

Implements parts of
https://mingle.corp.wikimedia.org/projects/internationalization/cards/3705

Change-Id: Ia9f01b5192d2fc2ec1548fe88aa7c1f7d4d8b815