课程讨论区，新建，编辑界面调整

app/views/messages/_course_new.html.erb

@@ -7,7 +7,8 @@
     <%= form_for @message, :url => {:action => 'new'}, :html => {:multipart => true, :id => 'message-form'} do |f| %>
       <%= render :partial => 'form_course', :locals => {:f => f,:is_new => true} %>
         <a href="#" onclick="submitCoursesBoard();"class="blue_btn fl c_white"><%= l(:button_submit)%></a>
-        <%= preview_link({:controller => 'messages', :action => 'preview', :board_id => @board}, 'message-form' ,target='preview',{:class => 'blue_btn grey_btn fl c_white'} )%>
+        <%#= preview_link({:controller => 'messages', :action => 'preview', :board_id => @board}, 'message-form' ,target='preview',{:class => 'blue_btn grey_btn fl c_white'} )%>
+        <%= link_to l(:button_cancel), course_boards_path(@course), :class => "blue_btn grey_btn fl c_white"%>
     <% end %>
   </ul>
 </div>

app/views/messages/edit.html.erb

@@ -21,7 +21,7 @@
           <%= link_to l(:button_cancel), board_message_url(@message.board, @message.root, :r => (@message.parent_id && @message.id)), :class => "ButtonColor m3p10"  %>
       <% end %>
 <% elsif @message.course %>
-    <%= course_board_breadcrumb(@message) %>
+    <%#= course_board_breadcrumb(@message) %>
       <div class="talk_new ml15">
         <ul>
           <%= form_for @message, {