Updated mediawiki/extensions
Project: mediawiki/extensions/UserMerge  c2662f57a675bf5bd2bfe0adaac14a434434d3c2

Migrate to JSON i18n

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

Change-Id: Id8f85ba9b7834052e615df5070d58107ece87a86