code: public void addDefaultLocale(String localeName) {
  
          Locale locale = getLocale(localeName);
          if (!m_defaultLocales.contains(locale)) {
              m_defaultLocales.add(locale);
              if (CmsLog.INIT.isInfoEnabled()) {
                  CmsLog.INIT.info(
                      Messages.get().getBundle().key(
                          Messages.INIT_I18N_CONFIG_DEFAULT_LOCALE_2,
                          new Integer(m_defaultLocales.size()),
                          locale));
  
              }
          }
      }
docs: Adds a locale to the list of default locales.<p>
  
  @param localeName the locale to add