$def with (ocaid)

$ i18n_strings = {
  $ "confirm_return": _("Really return this book?")
  $ }

<form
  action="/borrow/ia/$ocaid"
  method="post"
  class="return-form"
  data-i18n="$json_encode(i18n_strings)"
>
  <input class="cta-btn cta-btn--vanilla" type="submit" value="$_('Return book')" />
  <input type="hidden" name="action" value="return" />
  <input type="hidden" name="redirect" value="$request.fullpath" />
</form>