Migrate to JSON i18n

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

Change-Id: If94e1be18f43f649e03349f1b57817bac83d750c
Add missing global

Change-Id: I4ac794dabd253317e64c9a40e73783198ff9078c
Localisation updates from https://translatewiki.net.

Change-Id: I22fff446fe23729d1655d2ae9f054d5438dd7e82
Localisation updates from https://translatewiki.net.

Change-Id: I1967ce59366f38101f26927d34cdb2b57e69f1db
Localisation updates from https://translatewiki.net.

Change-Id: I6c26ecabc7a78caddafcb71a160639a0d08fdab3
Update i18n shim

A performance issue was fixed in the shim(s) generated by
generateJsonI18n.php, so it needed to be updated.

Change-Id: I0f02660b86fa7467debdba8a2ea7f4e28703cc00
Localisation updates from https://translatewiki.net.

Change-Id: Ieda492e4cde25eba902a8de112880faffbea40eb
Localisation updates from https://translatewiki.net.

Change-Id: I0040564a58e73925a453939f9e48022c1e9d3563
Localisation updates from https://translatewiki.net.

Change-Id: I87d877e1576cbf13b9b39d203ada0b41de068035
Localisation updates from https://translatewiki.net.

Change-Id: I335a946916d3a0adb92be5147cc46aea1ce06541
Merge