core-bundle/src/Resources/contao/classes/BackendTemplate.php
protected function getLocaleString()
	{
		$container = System::getContainer();

		return
			'var Contao={'
				. 'theme:"' . Backend::getTheme() . '",'
				. 'lang:{'
					. 'close:"' . $GLOBALS['TL_LANG']['MSC']['close'] . '",'
					. 'collapse:"' . $GLOBALS['TL_LANG']['MSC']['collapseNode'] . '",'
					. 'expand:"' . $GLOBALS['TL_LANG']['MSC']['expandNode'] . '",'
					. 'loading:"' . $GLOBALS['TL_LANG']['MSC']['loadingData'] . '",'
					. 'apply:"' . $GLOBALS['TL_LANG']['MSC']['apply'] . '"'
				. '},'
				. 'script_url:"' . $container->get('contao.assets.assets_context')->getStaticUrl() . '",'
				. 'path:"' . Environment::get('path') . '",'
				. 'request_token:"' . REQUEST_TOKEN . '",'
				. 'referer_id:"' . $container->get('request_stack')->getCurrentRequest()->attributes->get('_contao_referer_id') . '"'
			. '};';
	}
protected function getLocaleString()
	{
		$container = System::getContainer();

		return
			'var Contao={'
				. 'theme:"' . Backend::getTheme() . '",'
				. 'lang:{'
					. 'close:"' . $GLOBALS['TL_LANG']['MSC']['close'] . '",'
					. 'collapse:"' . $GLOBALS['TL_LANG']['MSC']['collapseNode'] . '",'
					. 'expand:"' . $GLOBALS['TL_LANG']['MSC']['expandNode'] . '",'
					. 'loading:"' . $GLOBALS['TL_LANG']['MSC']['loadingData'] . '",'
					. 'apply:"' . $GLOBALS['TL_LANG']['MSC']['apply'] . '"'
				. '},'
				. 'script_url:"' . $container->get('contao.assets.assets_context')->getStaticUrl() . '",'
				. 'path:"' . Environment::get('path') . '",'
				. 'request_token:"' . REQUEST_TOKEN . '",'
				. 'referer_id:"' . $container->get('request_stack')->getCurrentRequest()->attributes->get('_contao_referer_id') . '"'
			. '};';
	}
Return the locale string

@return string