code: public static String formatCurrency(ITemplate template, Object data, String currencyCode) {
          return formatCurrency(template, data, currencyCode, null);
      }
docs: Transformer method. Format currency using specified parameters
  @param template
  @param data
  @param currencyCode
  @return the currency string
  See {@link #formatCurrency(org.rythmengine.template.ITemplate, Object, String, java.util.Locale)}