Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  dfd777040b7f89bf310eaf8ea3e50d51fd2ab473
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only add images to watchlist view in alpha (alpha, 376)

note although the story specifies images should show in beta
in preparation for moving watchlist to stable i'm adding to alpha only

* add alpha class to body tag when in alpha mode
* add alpha to getConfig

Change-Id: Ie27f1fdd5bc096d9e0f034484f2c0e1f380f8158