Index: app/controllers/messages_controller.rb
===================================================================
--- app/controllers/messages_controller.rb	(revision 17736)
+++ app/controllers/messages_controller.rb	(working copy)
@@ -63,6 +63,7 @@
       if @message.save
         call_hook(:controller_messages_new_after_save, { :params => params, :message => @message})
         render_attachment_warning_if_needed(@message)
+        flash[:notice] = l(:notice_successful_create)
         redirect_to board_message_path(@board, @message)
       end
     end
@@ -80,6 +81,7 @@
       attachments = Attachment.attach_files(@reply, params[:attachments])
       render_attachment_warning_if_needed(@reply)
     end
+    flash[:notice] = l(:notice_successful_update)
     redirect_to board_message_path(@board, @topic, :r => @reply)
   end
 
@@ -101,6 +103,7 @@
     (render_403; return false) unless @message.destroyable_by?(User.current)
     r = @message.to_param
     @message.destroy
+    flash[:notice] = l(:notice_successful_delete)
     if @message.parent
       redirect_to board_message_path(@board, @message.parent, :r => r)
     else
Index: test/functional/messages_controller_test.rb
===================================================================
--- test/functional/messages_controller_test.rb	(revision 17736)
+++ test/functional/messages_controller_test.rb	(working copy)
@@ -129,6 +129,7 @@
           }
         }
     end
+    assert_equal I18n.t(:notice_successful_create), flash[:notice]
     message = Message.find_by_subject('Test created message')
     assert_not_nil message
     assert_redirected_to "/boards/1/topics/#{message.to_param}"
@@ -171,6 +172,7 @@
         }
       }
     assert_redirected_to '/boards/1/topics/1'
+    assert_equal I18n.t(:notice_successful_update), flash[:notice]
     message = Message.find(1)
     assert_equal 'New subject', message.subject
     assert_equal 'New body', message.content
@@ -189,6 +191,7 @@
         }
       }
     assert_redirected_to '/boards/1/topics/1'
+    assert_equal I18n.t(:notice_successful_update), flash[:notice]
     message = Message.find(1)
     assert_equal true, message.sticky?
     assert_equal true, message.locked?
@@ -222,6 +225,7 @@
       }
     reply = Message.order('id DESC').first
     assert_redirected_to "/boards/1/topics/1?r=#{reply.id}"
+    assert_equal I18n.t(:notice_successful_update), flash[:notice]
     assert Message.find_by_subject('Test reply')
   end
 
@@ -234,6 +238,7 @@
         }
     end
     assert_redirected_to '/projects/ecookbook/boards/1'
+    assert_equal I18n.t(:notice_successful_delete), flash[:notice]
     assert_nil Message.find_by_id(1)
   end
 
@@ -246,6 +251,7 @@
         }
     end
     assert_redirected_to '/boards/1/topics/1?r=2'
+    assert_equal I18n.t(:notice_successful_delete), flash[:notice]
     assert_nil Message.find_by_id(2)
   end