Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  53c2c450619d1ee571a28632d5a2ecd047a2d6a4

Hygiene: Merge Overlay and OverlayNew

Deprecate 'parent' usage

Change-Id: I1fdbe8c7bdcc6afd97d879694b5667ba513736fe