Translate strings with plurals

I want to translate %d product to %d producto and %d products to %d productos

Here is the original code:

<span>
            <?php
			echo sprintf(_n('<span class="total-items hidden-xs">%d product</span>', '<span class="total-items hidden-xs">%d products</span>', $woocommerce->cart->cart_contents_count, 'okthemes'), $woocommerce->cart->cart_contents_count);
            echo $woocommerce->cart->get_cart_total();
            ?>
            </span>

I filled these fields with no luck:
Original string: <span class=”total-items hidden-xs”>%d product</span>
Text domain: okthemes
Text context: empty
Replacement string: <span class=”total-items hidden-xs”>%d product</span>

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