refactor calculation code

- implement fee
- centralize the code

src/assets/locals/en.json

@@ -171,7 +171,7 @@
     "browseMenu": "Browse Menu",
     "paymentSummary": "Payment Summary",
     "subtotal": "Subtotal",
-    "tax": "Tax (10%)",
+    "tax": "Tax",
     "remove": "Remove",
     "proceedToCheckout": "Proceed to Checkout",
     "basketTotal": "Basket Total",
@@ -244,10 +244,12 @@
     "useLoyaltyPoints": "Use Loyalty Points",
     "noLoyaltyItemsInCart": "No loyalty items found in your cart",
     "pleaseAddLoyaltyItems": "Please add loyalty items to your cart to use loyalty points",
-    "loyaltyDiscountApplied": "Loyalty discount applied: {{itemName}} ({{amount}} off)"
+    "loyaltyDiscountApplied": "Loyalty discount applied: {{itemName}} ({{amount}} off)",
+    "deliveryFee": "Delivery Fee"
   },
   "checkout": {
     "title": "Checkout",
+    "cash": "Cash",
     "creditDebitCard": "Credit/Debit Card",
     "differentCard": "Different Card",
     "fascanoWallet": "Fascano Wallet",