Updated mediawiki/extensions
Project: mediawiki/extensions/GroupsSidebar  6784b9fcde2978c7fa5ca38f423e879f1280a7a3

Migrate to JSON i18n

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

Change-Id: I65882eacef9b4de57c722e95c8155e4a29ae9f93