code: public String getRuleSetDisplayName(String ruleSetName) {
          return getRuleSetDisplayName(ruleSetName, ULocale.getDefault(Category.DISPLAY));
      }
docs: Return the rule set display name for the provided rule set in the current default <code>DISPLAY</code> locale.
  @return the display name for the rule set
  @see #getRuleSetDisplayName(String,ULocale)
  @see Category#DISPLAY