Fix copy element feature

With the introduction of the Element Editor decorator this
feature broke.

Instead of using the class of the element_editor local variable
we use the remarkable type string that we exactly know in this case.

app/views/alchemy/admin/elements/_element_toolbar.html.erb

@@ -1,4 +1,4 @@
-<% remarkable_type = element.class.name.demodulize.underscore.pluralize %>
+<% remarkable_type = "elements" %>
 <div class="element-toolbar">
   <span class="element_tools">
     <div class="button_with_label">

spec/features/admin/edit_elements_feature_spec.rb

@@ -35,4 +35,17 @@
       expect(page).to have_selector(".add-nestable-element-button")
     end
   end
+
+  describe "Copy element", :js do
+    let!(:element) { create(:alchemy_element, page: a_page) }
+
+    scenario "is possible to copy element into clipboard" do
+      visit alchemy.admin_elements_path(page_id: element.page_id)
+      expect(page).to have_selector(".element-toolbar")
+      find(".fa-clone").click
+      within "#flash_notices" do
+        expect(page).to have_content(/Copied Article/)
+      end
+    end
+  end
 end