simplewiki has wgContentLanguage "en" and
nowiki has wgContentLanguage "nb".
See wgLanguageCode in https://noc.wikimedia.org/conf/InitialiseSettings.php.txt
But
wb.sites.getSite( 'nowiki' ).getLanguageCode() evaluates to "no" and
wb.sites.getSite( 'simplewiki' ).getLanguageCode() evaluates to "simple".
JavaScript gets the values from the PHP function getLanguageCode() in module wikibase.sites:
https://git.wikimedia.org/blob/mediawiki%2Fextensions%2FWikibase.git/HEAD/lib%2Fincludes%2Fmodules%2FSitesModule.php
getLanguageCode() should evaluate to wgContentLanguage of the target wiki.
Version: wmf-deployment
Severity: normal