code: public static final Function<Number,String> toPercentStr(Locale locale) {
          return new ToString(NumberFormatType.PERCENT, locale);
      }
docs: <p>
  A {@link String} representing a percentage is created from the target number
  in the given {@link Locale}
  </p>
  
  @param locale the {@link Locale} to be used
  @return the string representation of the input number as a percentage