allow adding discounts in cart

public/locales/en/cart.json

@@ -5,6 +5,7 @@
   "emptyCartMessageDescription": "Add items to your cart to continue.",
   "subtotal": "Subtotal",
   "total": "Total",
+  "promotionsTotal": "Promotions total",
   "table": {
     "item": "Item",
     "quantity": "Quantity",
@@ -24,10 +25,13 @@
     "timeoutAction": "Continue"
   },
   "discountCode": {
+    "title": "Gift card or promotion code",
     "label": "Add Promotion Code(s)",
     "apply": "Apply",
     "subtitle": "If you wish, you can add a promotion code",
-    "placeholder": "Enter promotion code"
+    "placeholder": "Enter promotion code",
+    "remove": "Remove promotion code",
+    "appliedCodes": "Promotion(s) applied:"
   },
   "items": {
     "synlabAnalyses": {