code: public void setIso6391(String iso6391) {
      if(iso6391 != null) {
        iso6391 = iso6391.trim();
      }
      this.iso6391 = iso6391;
    }
docs: Set ISO-639-1 code for the detected language.
  <p/>
  For more information on ISO-639-1: @see <a href="http://en.wikipedia.org/wiki/ISO_639-1">http://en.wikipedia.org/wiki/ISO_639-1</a></a>
  
  @param iso6391 ISO-639-1 code for the detected language