Remove $wgArticle dependency

Change-Id: I48326ccc2a85fd11765d0023e97b42167bb4d3c1
Localisation updates from https://translatewiki.net.

Change-Id: I59095da4efe0d8349b5cd04282e1af0ae148c680
Localisation updates from https://translatewiki.net.

Change-Id: I045b1a714e3630ef5618600539e60e05936f34a3
Migrate to JSON i18n

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

Change-Id: I0f497ca485d03a2ee84eeb9c7e9af89ed1fa40e1