@Override
  protected void formOK(UserRequest ureq) {
    if (importKeys.isVisible() && importKeys.getSelectedKeys().size() > 0) {
      Collection<String> importLangKeys = importKeys.getSelectedKeys();
      Set<String> alreadyInstalledLangs = new HashSet<String>();
      for (String langKey : importLangKeys) {
        if (I18nModule.getAvailableLanguageKeys().contains(langKey)) {
          alreadyInstalledLangs.add(langKey);
        }
      }
      if (I18nModule.isTransToolEnabled()) {
        // In translation mode importing will copy the language package
        // over an existing language or create a new language
        File tmpJar = importFile.getUploadFile();
        I18nManager.getInstance().copyLanguagesFromJar(tmpJar, importLangKeys);
        logAudit("Uploaded languages from jar::" + importFile.getUploadFileName(), null);
        showInfo("configuration.management.package.import.success", importLangKeys.toString());

      } else {
        // In language adaption mode: import is copied to user managed i18n package space in
        // olatdata
        if (alreadyInstalledLangs.size() == importLangKeys.size()) {
          showError("configuration.management.package.import.failure.installed");
          return;
        }
        // Ok, contains at least one language, copy to lang pack dir
        importFile.moveUploadFileTo(I18nModule.LANG_PACKS_DIRECTORY);
        logAudit("Uploaded language pack::" + importFile.getUploadFileName(), null);

        if (alreadyInstalledLangs.size() > 0) {
          getWindowControl()
              .setWarning(
                  getTranslator()
                      .translate(
                          "configuration.management.package.import.success.with.existing",
                          new String[] {
                            importLangKeys.toString(), alreadyInstalledLangs.toString()
                          }));
        } else {
          showInfo("configuration.management.package.import.success", importLangKeys.toString());
        }
      }
      // Reset i18n system
      I18nModule.reInitializeAndFlushCache();
      fireEvent(ureq, Event.DONE_EVENT);
    }
  }
 /**
  * @see org.olat.core.gui.control.DefaultController#event(org.olat.core.gui.UserRequest,
  *     org.olat.core.gui.control.Controller, org.olat.core.gui.control.Event)
  */
 @Override
 public void event(UserRequest ureq, Controller source, Event event) {
   if (source == dialogCtr) {
     if (DialogBoxUIFactory.isYesEvent(event)) {
       // Yes case, delete now
       for (String deleteLangPack : deleteLangPackSelection.getSelectedKeys()) {
         File file = new File(I18nModule.LANG_PACKS_DIRECTORY, deleteLangPack);
         if (file.exists()) file.delete();
         logAudit("Deleted language pack::" + deleteLangPack, null);
       }
       // Reset i18n system
       I18nModule.reInitializeAndFlushCache();
       // wow, everything worked fine
       showInfo(
           "configuration.management.package.delete.success",
           deleteLangPackSelection.getSelectedKeys().toString());
       fireEvent(ureq, Event.DONE_EVENT);
     } else {
       // No case, do nothing.
     }
   }
 }