case WebformMessageManagerInterface::DRAFTS_PREVIOUS:
    $t_args = [':href' => $this->requestHandler->getUrl($webform, $source_entity, 'webform.user.drafts')->toString()];
    return $this->t('You have pending drafts for this webform.') . ' ' . $this->t('<a href=":href">View your pending drafts</a>.', $t_args);