docs: public static String getDurationFormattedString(final long startMillis, final long endMillis,
              final VaadinMessageSource i18N) {
          final String formatDuration = DurationFormatUtils.formatPeriod(startMillis, endMillis, DURATION_FORMAT, false,
                  getBrowserTimeZone());
  
          final StringBuilder formattedDuration = new StringBuilder();
          final String[] split = formatDuration.split(",");
  
          for (int index = 0; index < split.length; index++) {
              if (index != 0 && formattedDuration.length() > 0) {
                  formattedDuration.append(' ');
              }
              final int value = Integer.parseInt(split[index]);
              if (value != 0) {
                  final String suffix = (value == 1) ? i18N.getMessage(DURATION_I18N.get(index).getSingle())
                          : i18N.getMessage(DURATION_I18N.get(index).getPlural());
                  formattedDuration.append(value).append(' ').append(suffix);
              }
  
          }
          return formattedDuration.toString();
  
      }