Neos\Flow\I18n\Locale::getLanguage PHP Method

    public function getLanguage()
    {
        return $this->language;
    }

 /**
  * Generates a URI path segment for a given node taking it's language dimension into account
  *
  * @param NodeInterface $node Optional node to determine language dimension
  * @param string $text Optional text
  * @return string
  */
 public function generateUriPathSegment(NodeInterface $node = null, $text = null)
 {
     if ($node) {
         $text = $text ?: $node->getLabel() ?: $node->getName();
         $dimensions = $node->getContext()->getDimensions();
         if (array_key_exists('language', $dimensions) && $dimensions['language'] !== array()) {
             $locale = new Locale($dimensions['language'][0]);
             $language = $locale->getLanguage();
         }
     } elseif (strlen($text) === 0) {
         throw new Exception('Given text was empty.', 1457591815);
     }
     $text = $this->transliterationService->transliterate($text, isset($language) ? $language : null);
     return Transliterator::urlize($text);
 }