code: public static PrettyTimeFormat prettyTimeFormat(final Locale locale)
      {
          return withinLocale(new Callable<PrettyTimeFormat>()
          {
              public PrettyTimeFormat call() throws Exception
              {
                  return context.get().getPrettyTimeFormat();
              }
          }, locale);
      }
docs: <p>
  Same as {@link #prettyTimeFormat()} for the specified locale.
  </p>
  
  @param locale
  Target locale
  @return PrettyTimeFormat instance
  @see PrettyTimeFormat