Symfony\Component\Console\Style\SymfonyStyle::askHidden PHP Method

    public function askHidden($question, $validator = null)
    {
        $question = new Question($question);

        $question->setHidden(true);
        $question->setValidator($validator);

        return $this->askQuestion($question);
    }

 /**
  * @return bool
  */
 private function askToInstall()
 {
     if (array_key_exists($this->workingLocale, $this->installedLocale)) {
         $reinstallLocale = $this->formatter->confirm('The locale is already installed, would you like to reinstall and overwrite the current translations?', false);
         if (!$reinstallLocale) {
             return true;
         }
         $this->installWorkingLocale(true);
         return true;
     }
     $install = $this->formatter->confirm('Would you like to install this locale?');
     if (!$install) {
         return false;
     }
     $this->formatter->writeln('<info>Before you can enable a new locale you need to authenticate to be able to create the pages</info>');
     while (!Authentication::loginUser($this->formatter->ask('Login'), $this->formatter->askHidden('Password'))) {
         $this->formatter->error('Failed to login, please try again');
     }
     if (!Authentication::isAllowedAction('Copy', 'Pages')) {
         $this->formatter->error('Your profile doesn\'t have the permission to execute the action Copy of the Pages module');
         return false;
     }
     $this->installWorkingLocale();
     $this->formatter->writeln('<info>Copying pages from the default locale to the current locale</info>');
     BackendPagesModel::copy($this->defaultEnabledLocale, $this->workingLocale);
     return true;
 }