Updated mediawiki/extensions
Project: mediawiki/extensions/HeaderTabs  f9af49dd605788146e67795b5cd65fadb797d9b1

Migrate to JSON i18n

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

Change-Id: I2102ac5e06c80375d6952e07c3f03bea2666f560