code: public static function convertXlfToPhp($strName, $strLanguage, $blnLoad=false)
  	{
  		@trigger_error('Using System::convertXlfToPhp() has been deprecated and will no longer work in Contao 5.0. Use the Contao\CoreBundle\Config\Loader\XliffFileLoader instead.', E_USER_DEPRECATED);
  
  		$rootDir = self::getContainer()->getParameter('kernel.project_dir');
  
  		// Convert to absolute path
  		if (strpos($strName, $rootDir . '/') === false)
  		{
  			$strName = $rootDir . '/' . $strName;
  		}
  
  		$loader = new XliffFileLoader(static::getContainer()->getParameter('kernel.project_dir'), $blnLoad);
  
  		return $loader->load($strName, $strLanguage);
  	}
docs: Convert an .xlf file into a PHP language file
  
  @param string  $strName     The name of the .xlf file
  @param string  $strLanguage The language code
  @param boolean $blnLoad     Add the labels to the global language array
  
  @return string The PHP code
  
  @deprecated Deprecated since Contao 4.0, to be removed in Contao 5.0.
  Use the Contao\CoreBundle\Config\Loader\XliffFileLoader instead.