Use our own objects and translations, add link to legacy promotions

This commit isn't super clear cut but really small: It adds a link to
the top of the promotions index to the legacy Solidus promotions
overview, and it also switches out some of the uses of the legacy system
for our system.

app/views/solidus_friendly_promotions/admin/promotions/index.html.erb

@@ -1,9 +1,12 @@
-<% admin_breadcrumb(plural_resource_name(Spree::Promotion)) %>
+<% admin_breadcrumb(plural_resource_name(SolidusFriendlyPromotions::Promotion)) %>
 
 <% content_for :page_actions do %>
-  <% if can? :create, Spree::Promotion %>
+  <% if can? :create, SolidusFriendlyPromotions::Promotion %>
     <li>
-      <%= link_to t('spree.new_promotion'), spree.new_admin_promotion_path, class: 'btn btn-primary' %>
+      <%= link_to t('solidus_friendly_promotions.new_promotion'), solidus_friendly_promotions.new_admin_promotion_path, class: 'btn btn-primary' %>
+    </li>
+    <li>
+      <%= link_to t('solidus_friendly_promotions.legacy_promotions'), spree.admin_promotions_path, class: 'btn btn-primary' %>
     </li>
   <% end %>
 <% end %>
@@ -118,7 +121,7 @@
 <% else %>
   <div class="no-objects-found">
     <%= render 'spree/admin/shared/no_objects_found',
-                 resource: Spree::Promotion,
+                 resource: SolidusFriendlyPromotions::Promotion,
                  new_resource_url: new_object_url %>
   </div>
 <% end %>

config/locales/en.yml

@@ -25,6 +25,7 @@ en:
     new_promotion: New Promotion
     new_promotion_category: New Promotion Category
     new_promotion_code_batch: New Promotion Code Batch
+    legacy_promotions: Legacy Promotions
     no_rules_addes: No Rules Added
     promotion_successfully_created: Promotion has been successfully created!
     promotion_total_changed_before_complete: One or more of the promotions on your order have become ineligible and were removed. Please check the new order amounts and try again.

spec/requests/solidus_friendly_promotions/admin/promotion_actions_request_spec.rb

@@ -15,7 +15,7 @@
       }
     }
     expect(response).to be_redirect
-    expect(response).to redirect_to spree.edit_admin_promotion_path(promotion)
+    expect(response).to redirect_to solidus_friendly_promotions.edit_admin_promotion_path(promotion)
     expect(promotion.actions.count).to eq(1)
   end
 
@@ -24,7 +24,7 @@
       promotion_action: {type: "Spree::InvalidType"}
     }
     expect(response).to be_redirect
-    expect(response).to redirect_to spree.edit_admin_promotion_path(promotion)
+    expect(response).to redirect_to solidus_friendly_promotions.edit_admin_promotion_path(promotion)
     expect(promotion.actions.count).to eq(0)
   end
 end