code: protected function getLangValue($arrValues, $strLangCode = null)
      {
          if (!($this->getMetaModel()->isTranslated() && is_array($arrValues))) {
              return $arrValues;
          }
  
          if ($strLangCode === null) {
              return $this->getLangValue($arrValues, $this->getMetaModel()->getActiveLanguage());
          }
  
          if (array_key_exists($strLangCode, $arrValues)) {
              return $arrValues[$strLangCode];
          }
  
          // Language code not set, use fallback.
          return $arrValues[$this->getMetaModel()->getFallbackLanguage()];
      }
docs: This extracts the value for the given language from the given language array.
  
  If the language is not contained within the value array, the fallback language from the parenting
  {@link IMetaModel} instance is tried as well.
  
  @param array  $arrValues   The array holding all language values in the form array('langcode' => $varValue).
  
  @param string $strLangCode The language code of the language to fetch. Optional, if not given,
  $GLOBALS['TL_LANGUAGE'] is used.
  
  @return mixed|null the value for the given language or the fallback language, NULL if neither is present.