code: public URIBuilder appendLocale(URIBuilder builder, Locale locale) {
  		if (locale != null) {
  			builder.addParameter("lang", locale.getLanguage());
  		}
  		return builder;
  	}
docs: Appends a locale language parameter to the URI builder. Won't do anything
  if the locale is <tt>null</tt>.
  
  @param builder the builder to append to
  @param locale the locale to append
  @return the same builder, for chaining