diff --git a/app/api/mobile/apis/comments.rb b/app/api/mobile/apis/comments.rb
index 75932d60f..2e84fe5a9 100644
--- a/app/api/mobile/apis/comments.rb
+++ b/app/api/mobile/apis/comments.rb
@@ -2,6 +2,7 @@
 module Mobile
   module Apis
     class Comments < Grape::API
+      include ApplicationHelper
       resource :comments do
         desc '课程通知评论'
         params do
@@ -82,8 +83,8 @@ module Mobile
               memo: {:subject => params[:subject],:content => '该贴来自手机App意见反馈'},
           }
           cs = CommentService.new
-          memo = cs.create_feedback cs_params, current_user
-          raise "commit failed #{memo.errors.full_messages}" if memo.new_record?
+          memo,message = cs.create_feedback cs_params, current_user
+          raise message if memo.new_record?
           present :status, 0
         end
 
diff --git a/app/controllers/forums_controller.rb b/app/controllers/forums_controller.rb
index 2f7092d9a..64157ea42 100644
--- a/app/controllers/forums_controller.rb
+++ b/app/controllers/forums_controller.rb
@@ -20,7 +20,7 @@ class ForumsController < ApplicationController
       #@memo.author_id = User.current.id
       #@forum = @memo.forum
       cs = CommentService.new
-      @memo = cs.create_feedback params,User.current
+      @memo,message = cs.create_feedback params,User.current
       respond_to do |format|
         if !@memo.new_record?
           format.html { redirect_to forum_path(@memo.forum) }
diff --git a/app/helpers/api_helper.rb b/app/helpers/api_helper.rb
index c865a500b..afdc306a4 100644
--- a/app/helpers/api_helper.rb
+++ b/app/helpers/api_helper.rb
@@ -60,4 +60,8 @@ module ApiHelper
     end
     [count,is_teacher]
   end
+
+  def get_user_language user
+    (user.language.nil? || user.language == "") ? 'zh':user.language
+  end
 end
\ No newline at end of file
diff --git a/app/services/comment_service.rb b/app/services/comment_service.rb
index e74cc902b..f75e14b85 100644
--- a/app/services/comment_service.rb
+++ b/app/services/comment_service.rb
@@ -1,4 +1,6 @@
 class CommentService
+  include ApiHelper
+  include Redmine::I18n
   #评论
   def news_comments params,current_user
     @news = News.find(params[:id])
@@ -84,7 +86,8 @@ class CommentService
     @memo.forum_id = "1"
     @memo.author_id = current_user.id
     @memo.save
-    @memo
+    message = "#{l(:label_commit_failed,:locale => get_user_language(current_user))}: #{@memo.errors.full_messages}" if @memo.new_record?
+    [@memo,message]
   end
 
   #课程留言列表
diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index 4512344ad..c689d699d 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -346,7 +346,7 @@ class CoursesService
       membership = @user.coursememberships.all(:conditions => Course.visible_condition(current_user))
     end
     if membership.nil? || membership.count == 0
-      raise l(:label_no_courses,:locale => current_user.language.nil? ? 'zh':current_user.language)
+      raise l(:label_no_courses,:locale => get_user_language(current_user))
     end
     membership.sort! {|older, newer| newer.created_on <=> older.created_on }
     result = []
@@ -355,19 +355,19 @@ class CoursesService
       latest_course_dynamics = []
       latest_news = course.news.order("created_on desc").first
       unless latest_news.nil?
-        latest_course_dynamics << {:type => 1,:time => latest_news.created_on,:message => l(:label_recently_updated_notification,:locale => current_user.language.nil? ? 'zh':current_user.language)}
+        latest_course_dynamics << {:type => 1,:time => latest_news.created_on,:message => l(:label_recently_updated_notification,:locale => get_user_language(current_user))}
       end
       latest_message = course.journals_for_messages.order("created_on desc").first
       unless latest_message.nil?
-        latest_course_dynamics << {:type => 2,:time => latest_message.created_on,:message => l(:label_recently_updated_message,:locale => current_user.language.nil? ? 'zh':current_user.language)}
+        latest_course_dynamics << {:type => 2,:time => latest_message.created_on,:message => l(:label_recently_updated_message,:locale => get_user_language(current_user))}
       end
       latest_attachment = course.attachments.order("created_on desc").first
       unless latest_attachment.nil?
-        latest_course_dynamics << {:type => 3,:time => latest_attachment.created_on,:message => l(:label_recently_updated_courseware,:locale => current_user.language.nil? ? 'zh':current_user.language)}
+        latest_course_dynamics << {:type => 3,:time => latest_attachment.created_on,:message => l(:label_recently_updated_courseware,:locale => get_user_language(current_user))}
       end
       latest_bid = course.homeworks.order('updated_on DESC').first
       unless latest_bid.nil?
-        latest_course_dynamics << {:type => 4,:time => latest_bid.updated_on,:message => l(:label_recently_updated_homework,:locale => current_user.language.nil? ? 'zh':current_user.language)}
+        latest_course_dynamics << {:type => 4,:time => latest_bid.updated_on,:message => l(:label_recently_updated_homework,:locale => get_user_language(current_user))}
       end
       #每个作业中的最新留言
       messages = []
@@ -382,7 +382,7 @@ class CoursesService
       end
       latest_bid_message = messages.first
       unless latest_bid_message.nil?
-        latest_course_dynamics << {:type => 4,:time => latest_bid_message.created_on,:message => l(:label_recently_updated_message,:locale => current_user.language.nil? ? 'zh':current_user.language)}
+        latest_course_dynamics << {:type => 4,:time => latest_bid_message.created_on,:message => l(:label_recently_updated_message,:locale => get_user_language(current_user))}
       end
       #每个作业中学生最后提交的作业
       homeworks = []
@@ -397,7 +397,7 @@ class CoursesService
       end
       latest_homework_attach = homeworks.first
       unless latest_homework_attach.nil?
-        latest_course_dynamics << {:type => 4,:time => latest_homework_attach.updated_at,:message => l(:label_recently_updated_homework,:locale => current_user.language.nil? ? 'zh':current_user.language)}
+        latest_course_dynamics << {:type => 4,:time => latest_homework_attach.updated_at,:message => l(:label_recently_updated_homework,:locale => get_user_language(current_user))}
       end
       latest_course_dynamics.sort!{|order,newer| newer[:time] <=> order[:time]}
       latest_course_dynamic = latest_course_dynamics.first
diff --git a/config/locales/en.yml b/config/locales/en.yml
index e84a26815..33e4da965 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1588,3 +1588,5 @@ en:
   label_recently_updated_message: Recently updated the message
   label_recently_updated_courseware: Recently updated the courseware
   label_no_courses: You do not participate in any course, please search the curriculum, course, or create a course!
+  label_commit_failed: commit failed
+  #api end
\ No newline at end of file
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index dc1937926..5628598cc 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -2032,6 +2032,9 @@ zh:
   label_recently_updated_message: 最近更新了留言
   label_recently_updated_courseware: 最近更新了课件
   label_no_courses: 您没有参与任何课程，请搜索课程、加入课程，或者创建课程吧！
+  label_commit_failed: 提交失败
+  #api end
+
   label_end_time: 截止时间
   label_send_email: 确定发送
   label_input_email: 请输入邮箱地址