This way the value of `--lang` is available to `LocalSettingsGenerator`.
Bug: T210998
Change-Id: I8b6bd83603687e4d23fc7e0642c3b8f27157b62d
global $wgLang, $wgLanguageCode;
$this->setVar( '_UserLang', $options['lang'] );
$wgLanguageCode = $options['lang'];
+ $this->setVar( 'wgLanguageCode', $wgLanguageCode );
$wgContLang = MediaWikiServices::getInstance()->getContentLanguage();
$wgLang = Language::factory( $options['lang'] );
RequestContext::getMain()->setLanguage( $wgLang );