Updated mediawiki/extensions
Project: mediawiki/extensions/ExtTab  606ccb65e486e4f9f28f9718d1a82614c3b00f6f

Migrate to JSON i18n

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

Change-Id: Ibaba9654152a81fa133a8062423f8574f7d9a813