Improve the UI and tests

frontend/src/locales/en/purchase_orders.json

@@ -0,0 +1,36 @@
+{
+  "purchase_order": "Purchase Order",
+  "purchase_orders": "Purchase Orders",
+  "created": "Created",
+  "supplier": "Supplier",
+  "order_date": "Order Date",
+  "expected_delivery": "Expected Delivery",
+  "items": "Items",
+  "no_items": "No items in this order",
+  "notes": "Notes",
+  "not_found": "Purchase order not found",
+  "total_amount": "Total Amount",
+  "status": {
+    "draft": "Draft",
+    "pending_approval": "Pending Approval",
+    "approved": "Approved",
+    "sent": "Sent",
+    "partially_received": "Partially Received",
+    "received": "Received",
+    "cancelled": "Cancelled"
+  },
+  "details": {
+    "title": "Purchase Order Details",
+    "quick_view": "Quick Order View",
+    "summary": "Summary",
+    "supplier_info": "Supplier Information",
+    "delivery_info": "Delivery Information",
+    "order_items": "Order Items",
+    "additional_notes": "Additional Notes"
+  },
+  "actions": {
+    "approve": "Approve Order",
+    "modify": "Modify Order",
+    "close": "Close"
+  }
+}