Update Invoice and PurchaseOrder models to replace 'customer' with 'client' and change 'processing' color to 'purple'

src/database/models/Invoice.js

@@ -118,8 +118,8 @@ export const Invoice = {
       }
     }
   ],
-  group: ['vendor', 'customer', 'invoiceType'],
-  filters: ['vendor', 'customer', 'invoiceType'],
+  group: ['vendor', 'client', 'invoiceType'],
+  filters: ['vendor', 'client', 'invoiceType'],
   sorters: ['createdAt', 'state', 'updatedAt', 'invoiceDate', 'dueDate'],
   columns: [
     '_id',
@@ -127,7 +127,7 @@ export const Invoice = {
     'state',
     'invoiceType',
     'vendor',
-    'customer',
+    'client',
     'invoiceDate',
     'dueDate',
     'totalAmount',

src/database/models/PurchaseOrder.js

@@ -308,7 +308,7 @@ export const PurchaseOrder = {
       name: 'acknowledged.count',
       label: 'Acknowledged',
       type: 'number',
-      color: 'processing'
+      color: 'purple'
     },
     {
       name: 'partiallyShipped.count',