Refactor cart voucher templates to replace promotional text with "KOD RABATOWY:" in multiple themes and modules. Removed unused temporary image files from the checkout module.

themes/EZE-249/templates/checkout/_partials/cart-voucher.tpl

@@ -28,9 +28,7 @@
       <div class="cart-voucher">
         {if $cart.discounts|count > 0}
           <div class="promo-highlighted">
-            <h4>
-              {l s='Take advantage of our exclusive offers:' d='Shop.Theme.Actions'}
-            </h4>
+            <h4>KOD RABATOWY:</h4>
             <ul class="js-discount">
               {foreach from=$cart.discounts item=discount}
                 <li>