_update_message_text

_update_message_text($msg_type, $msg_reason, $langcode = NULL)

function _update_message_text($msg_type, $msg_reason, $langcode = NULL) {
  $text = '';
  switch ($msg_reason) {
    case UPDATE_NOT_SECURE:
      if ($msg_type == 'core') {
        $text = t('There is a security update available for your version of Drupal. To ensure the security of your server, you should update immediately!', array(), array('langcode' => $langcode));
      }
      else {
        $text = t('There are security updates available for one or more of your modules or themes. To ensure the security of your server, you should update immediately!', array(), array('langcode' => $langcode));
      }
      break;

    case UPDATE_REVOKED:
      if ($msg_type == 'core') {
        $text = t('Your version of Drupal has been revoked and is no longer available for download. Upgrading is strongly recommended!', array(), array('langcode' => $langcode));
      }
      else {
        $text = t('The installed version of at least one of your modules or themes has been revoked and is no longer available for download. Upgrading or disabling is strongly recommended!', array(), array('langcode' => $langcode));
      }
      break;

    case UPDATE_NOT_SUPPORTED:
      if ($msg_type == 'core') {
        $text = t('Your version of Drupal is no longer supported. Upgrading is strongly recommended!', array(), array('langcode' => $langcode));
      }
      else {
        $text = t('The installed version of at least one of your modules or themes is no longer supported. Upgrading or disabling is strongly recommended. See the project homepage for more details.', array(), array('langcode' => $langcode));
      }
      break;

    case UPDATE_NOT_CURRENT:
      if ($msg_type == 'core') {
        $text = t('There are updates available for your version of Drupal. To ensure the proper functioning of your site, you should update as soon as possible.', array(), array('langcode' => $langcode));
      }
      else {
        $text = t('There are updates available for one or more of your modules or themes. To ensure the proper functioning of your site, you should update as soon as possible.', array(), array('langcode' => $langcode));
      }
      break;

    case UPDATE_UNKNOWN:
    case UPDATE_NOT_CHECKED:
    case UPDATE_NOT_FETCHED:
    case UPDATE_FETCH_PENDING:
      if ($msg_type == 'core') {
        $text = t('There was a problem checking <a href=":update-report">available updates</a> for Drupal.', array(':update-report' => \Drupal::url('update.status')), array('langcode' => $langcode));
      }
      else {
        $text = t('There was a problem checking <a href=":update-report">available updates</a> for your modules or themes.', array(':update-report' => \Drupal::url('update.status')), array('langcode' => $langcode));
      }
      break;
  }

  return $text;
}