code: public static boolean contains(final Label label, final String labelString) {
          final String withoutWhite = StringProcessor.removeWhiteSpaces(labelString);
          for (final Label.MapFieldEntry entry : label.getEntryList()) {
              for (final String value : entry.getValueList()) {
                  if (StringProcessor.removeWhiteSpaces(value).equalsIgnoreCase(withoutWhite)) {
                      return true;
                  }
              }
          }
          return false;
      }
docs: Test if a label contains a label string. This test iterates over all languages and all
  label strings for the language and check if one equals the label string.
  The test is done ignoring the case of the label string and ignoring white spaces.
  
  @param label       the label type which is checked
  @param labelString the label string that is tested if it is contained in the label type
  
  @return if the labelString is contained in the label type