Migrate to JSON i18n

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

This patch sets depends on change I50989bd425e34f4b625397f879b73bf3929d012c

Bug: 63258
Change-Id: I8b9f2c13a9d18e973c81fe914d1cdfc6aec1d4b0
Merge "Migrate to JSON i18n"