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// catalog/language/russian/common/cart.php
// catalog/language/russian/checkout/cart.php

$_['text_items']     = 'Товаров: <b>%1$s шт.</b><br>На сумму: <span id="cart-total">%2$s</span>
	<span class="count">%1$s</span>';
	
// catalog/controller/checkout/cart.php (изменять не нужно, просто, для понимания)	
$json['total'] = sprintf($this->language->get('text_items'), $this->cart->countProducts() + (isset($this->session->data['vouchers']) ? count($this->session->data['vouchers']) : 0), $this->currency->format($total));