code: private static String generateName(Locale locale) {
      StringBuilder str = new StringBuilder();
      str.append("models_").append(locale.getLanguage());
  
      if (locale.getCountry() != null && !locale.getCountry().isEmpty())
        str.append("_").append(locale.getCountry());
  
      str.append(".xml");
  
      return str.toString();
    }
docs: Generates the name of the file to be used according to the language chosen.
  
  @param locale
  contains the language that will be used
  @return the <code>String</code> which names the .xml file to be used
  according to the language