fix(back-end) calculator improvements

frontend/src/assets/i18n/en.json

@@ -57,6 +57,7 @@
     "CALCULATE": "Calculate Quote",
     "RESULT": "Estimated Quote",
     "TIME": "Print Time",
+    "MACHINE_COST": "Machine Cost",
     "COST": "Total Cost",
     "ORDER": "Order Now",
     "CONSULT": "Request Consultation",
@@ -178,6 +179,8 @@
     "PROCESSING": "Processing...",
     "SUMMARY_TITLE": "Order Summary",
     "SUBTOTAL": "Subtotal",
+    "ITEMS_BASE_SUBTOTAL": "Items Subtotal",
+    "MACHINE_COST": "Machine Cost",
     "SETUP_FEE": "Setup Fee",
     "TOTAL": "Total",
     "QTY": "Qty",