code: private void activateDefaultFalseFriendRules()
        throws ParserConfigurationException, SAXException, IOException {
      String falseFriendRulesFilename = JLanguageTool.getDataBroker().getRulesDir() + "/" + FALSE_FRIEND_FILE;
      userRules.addAll(loadFalseFriendRules(falseFriendRulesFilename));
    }
docs: Loads and activates the false friend rules from
  <code>rules/false-friends.xml</code>.