Localisation updates from https://translatewiki.net.

Change-Id: I462a63b45dac7efa5b82af1fbef5427d5c9837eb
Migrate to JSON i18n

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

Change-Id: I84f2c9dd73d4e40b12eae241577da8d82b9d6f23
Localisation updates from https://translatewiki.net.

Change-Id: Ida5b47ba700d26c11df649fead82b4682b1f5f49