fix learning objects helper

app/helpers/learning_objects_helper.rb

@@ -5,14 +5,14 @@ module LearningObjectsHelper
   end
 
   def learning_object_thumbnail(learning_object, size = "")
-    if learning_object.thumbnail.nil? || learning_object.thumbnail == "thumbnai" # TODO: remove "thumbnai" when possible
+    if learning_object.thumbnail.nil?
       if size == "large"
-        image_tag('learning-object-preview-large.png')
+        image_tag 'learning-object-preview-large.png', class: "thumbnail"
       else
-        image_tag('learning-object-preview.png')
+        image_tag 'learning-object-preview.png', class: "thumbnail"
       end
     else
-      image_tag learning_object.thumbnail, alt: learning_object_title(learning_object)
+      image_tag learning_object.thumbnail, alt: learning_object_title(learning_object), class: "thumbnail"
     end
   end
 

app/views/learning_objects/_learning_object_horizontal.erb

@@ -15,7 +15,7 @@
 
     <div class="media-body">
       <%= link_to link do %>
-          <h4><%= learning_object_title learning_object %></h4>
+          <h4 class="media-heading"><%= learning_object_title learning_object %></h4>
       <% end %>
 
       <span>Por <%= link_to 'João', '#' %></span><br/>

app/views/learning_objects/_learning_object_vertical.erb

@@ -9,10 +9,10 @@
       <% end %>
     </div>
     <div class="panel-body">
-          <h4 class="media-heading"><%= learning_object_title(learning_object) %></h4>
+      <h4 class="media-heading"><%= learning_object_title(learning_object) %></h4>
       <span class="glyphicon glyphicon-eye-open"><%= learning_object.views %>&nbsp;</span>
       <span class="glyphicon glyphicon-star"><%= learning_object.likes %>&nbsp;</span>
       <span>Por <a>Usuário&nbsp;</a></span>
     </div>
   </div>
-</div>
\ No newline at end of file
+</div>