Include product submenu on product import confirmation

app/views/admin/dfc_product_imports/index.html.haml

@@ -1,3 +1,7 @@
-%h2 Importing a DFC product catalog
-%p Imported products:
+- content_for :page_title do
+  #{t(".title")}
+
+= render partial: 'spree/admin/shared/product_sub_menu'
+
+%p= t(".imported_products")
 = @count

config/locales/en.yml

@@ -757,6 +757,10 @@ en:
         user_guide: User Guide
         map: Map
 
+    dfc_product_imports:
+      index:
+        title: "Importing a DFC product catalog"
+        imported_products: "Imported products:"
     enterprise_fees:
       index:
         title: "Enterprise Fees"