Updated mediawiki/extensions
Project: mediawiki/extensions/NewUserMessage  68855aafaca38e1d5c56915386e951183e00d276

Migrate to JSON i18n

Procedure per https://www.mediawiki.org/wiki/Manual:GenerateJsonI18n.php
with shim.

Change-Id: I01b095fd8d6c4102da8299654b35f8711c999b95