Updated mediawiki/extensions
Project: mediawiki/extensions/WikiForum  df12fb8880542fcbc961d52cf0b681e51ce6206f

Migrate to JSON i18n

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

Change-Id: If7bf82edab02fc050a5527cdcd8c518972a4eabb