Localisation updates from https://translatewiki.net.

Change-Id: I67a11444eaa26f0f16aed59dc4f824dc422514ef
Migrate to JSON i18n

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

Change-Id: I402d3159a8a1b239c2e93cda91291b491b8a7532