uc_teaser_add_to_cart_text changes to uc_product_add_to_cart_text

hi,
the drupal variable "uc_teaser_add_to_cart_text" found at uc_product.module is never used as an product field label text.

/**
 * @ingroup forms
 * @see
 *   uc_product_forms()
 *   uc_catalog_buy_it_now_form_validate()
 *   uc_catalog_buy_it_now_form_submit()
 */
function uc_catalog_buy_it_now_form($form_state, $node) {
  $form = array();
  $form['#validate'][] = 'uc_catalog_buy_it_now_form_validate';
  $form['#submit'][] = 'uc_catalog_buy_it_now_form_submit';
  $form['nid'] = array('#type' => 'hidden', '#value' => $node->nid);
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' =>  variable_get('uc_teaser_add_to_cart_text', t('Add to cart')),
    '#id' => 'edit-submit-'. $node->nid,
    '#attributes' => array(
      'class' => 'list-add-to-cart',
    ),
  );
  return $form;
}

the "Add to card" Button is blank.

after change the variable to "uc_product_add_to_cart_text" every thing is working well and the Button Label will show up as is defined under
"admin/store/settings/products/edit/fields"