Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  31a8dcf603c9bfefe5a72b5f3d4e94197b582e3c

Hygiene: use the same base HTML in normal editor and VE

All the headers are the same, edit summary and captcha panels are the
same too. Incidentally, this fixes the preview header in VE.

Also, move EditorOverlayBase files to editorNew directories (it's not
used in stable and uses OverlayNew).

Change-Id: I1638fc967747976ccc69b18aa24ab7c38642b10a