Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  c734e573e90c829fed5a2ce99d0bfbcb84fa7920

Prevent uploading of anything other than images

Wait for the preview image to load. If it fails to do so
assume a bad filetype has been given.

Change-Id: I4a3404380524ae6b16d431024d706e0089ae0258