Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  90afe2bef0e101ede4658694759e48b8886e58f1
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(bug 42708) Show image upload preview when using Android gallery

Android browser doesn't like data URLs without mimetypes.

Change-Id: Ic2f71953a23f90112ca2db4d092ec8c7da789379