adding notice message when user click in preview button (Fixes #34)

app/helpers/learning_objects/builder_helper.rb

@@ -2,4 +2,8 @@ module LearningObjects::BuilderHelper
   def get_mime_types learning_object
     @learning_object.object_type.mime_types.map(&:extension)
   end
+
+  def preview_notice(learning_object)
+    %Q[Esta é uma pré-visualização do conteúdo #{learning_object.name}. #{ link_to 'Clique aqui para voltar ao estúdio de criação', :back }]
+  end
 end
\ No newline at end of file

app/views/learning_objects/build/_file_upload_form.html.erb

@@ -40,7 +40,7 @@
     <div id="results" class="panel"></div>
 
     <div class="large-12 columns">
-      <%= link_to @learning_object do %>
+      <%= link_to @learning_object, notice: preview_notice(@learning_object) do %>
           <button type="submit" class="btn-submit btn btn-primary btn-outline-rounded blue">
             Visualizar <i style="margin-left:10px;" class="fa fa-eye"></i></button>
       <% end %>