Slight localization file mistake

WP-Store’ pot-file has strings “%s Item” and “%s Items”. File “header.php” has these words too, it works fine, but file “wp-store-functions.php” (wp_store_woocommerce_header_add_to_cart_fragment function) contains “%1$s Item” and “%1$s Items” (they also show basket content as header.php’s strings). They cannot be translated because of their absence in pot-file.