Make translated labels work on index, show pages

Problem:

At the moment, developers can customize a field's label on form pages
with the following translation structure:

```
en:
  helpers:
    label:
      customer:
        name: Full Name
```

Many developers expect this label change to take effect
on the `show` and `index` pages, as well as the form page.

Solution:

Translate attribute labels with I18n before displaying them
on `show` and `index` pages.

app/controllers/administrate/application_controller.rb

@@ -107,6 +107,7 @@ def permitted_attributes
 
     delegate :resource_class, :resource_name, :namespace, to: :resource_resolver
     helper_method :namespace
+    helper_method :resource_name
 
     def resource_resolver
       @_resource_resolver ||=

app/views/administrate/application/_collection.html.erb

@@ -22,13 +22,17 @@ to display a collection of resources in an HTML table.
   <thead>
     <tr>
       <% collection_presenter.attribute_types.each do |attr_name, attr_type| %>
-        <th class="cell-label cell-label--<%= attr_type.html_class %>
-          cell-label--<%= collection_presenter.ordered_html_class(attr_name) %>
+        <th class="cell-label
+        cell-label--<%= attr_type.html_class %>
+        cell-label--<%= collection_presenter.ordered_html_class(attr_name) %>
         " scope="col">
         <%= link_to(params.merge(
           collection_presenter.order_params_for(attr_name)
         )) do %>
-            <%= attr_name.to_s.titleize %>
+        <%= t(
+          "helpers.label.#{resource_name}.#{attr_name}",
+          default: attr_name.to_s,
+        ).titleize %>
 
             <% if collection_presenter.ordered_by?(attr_name) %>
               <span class="cell-label__sort-indicator cell-label__sort-indicator--<%= collection_presenter.ordered_html_class(attr_name) %>">

app/views/administrate/application/show.html.erb

@@ -31,7 +31,12 @@ as well as a link to its edit page.
 
 <dl>
   <% page.attributes.each do |attribute| %>
-    <dt class="attribute-label"><%= attribute.name.titleize %></dt>
+    <dt class="attribute-label">
+    <%= t(
+      "helpers.label.#{resource_name}.#{attribute.name}",
+      default: attribute.name.titleize,
+    ) %>
+    </dt>
 
     <dd class="attribute-data attribute-data--<%=attribute.html_class%>"
         ><%= render_field attribute %></dd>

app/views/fields/date_time/_show.html.erb

@@ -17,5 +17,5 @@ as a localized date & time string.
 %>
 
 <% if field.data %>
-  <%= l field.data %>
+  <%= l(field.data, default: field.data) %>
 <% end %>

app/views/fields/has_many/_show.html.erb

@@ -36,5 +36,5 @@ from the associated resource class's dashboard.
   <% end %>
 
 <% else %>
-  <%= t("administrate.fields.has_many.none") %>
+  <%= t("administrate.fields.has_many.none", default: "–") %>
 <% end %>

spec/features/index_page_spec.rb

@@ -38,6 +38,26 @@
     expect(current_path).to eq(new_admin_customer_path)
   end
 
+  it "displays translated labels" do
+    custom_label = "Newsletter Subscriber"
+
+    translations = {
+      helpers: {
+        label: {
+          customer: {
+            email_subscriber: custom_label,
+          },
+        },
+      },
+    }
+
+    with_translations(:en, translations) do
+      visit admin_customers_path
+
+      expect(page).to have_table_header(custom_label)
+    end
+  end
+
   it "paginates records based on a constant" do
     customers = create_list(:customer, 2)
 

spec/features/show_page_spec.rb

@@ -58,4 +58,25 @@
 
     expect(page).to have_header("Edit #{displayed(customer)}")
   end
+
+  it "displays translated labels" do
+    custom_label = "Newsletter Subscriber"
+    customer = create(:customer)
+
+    translations = {
+      helpers: {
+        label: {
+          customer: {
+            email_subscriber: custom_label,
+          },
+        },
+      },
+    }
+
+    with_translations(:en, translations) do
+      visit admin_customer_path(customer)
+
+      expect(page).to have_css(".attribute-label", text: custom_label)
+    end
+  end
 end

spec/support/features/page_elements.rb

@@ -6,4 +6,8 @@ def have_header(title)
   def have_label(title)
     have_css("label", text: title)
   end
+
+  def have_table_header(title)
+    have_css("th", text: title)
+  end
 end