Updated mediawiki/extensions
Project: mediawiki/extensions/CheckUser  4c8c7c914f5a08582e787255c297010354c3c66e

Migrate to JSON i18n

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

Change-Id: I6bb8420649135c08fbe4dd5179a20e5999d02a14