Updated mediawiki/extensions
Project: mediawiki/extensions/ContactPage  d3ed45ef8264f31141842085711d040cde2832fa

Move key usermailererror here from core

This extension was using the key and it was used nowhere else. So moved it
here and prefixed it with the extension name.

Change-Id: Ia2d15b56cbf0dafd9d6e53f0e1cdd71cde331347