diff --git a/app/views/markdown/_area.html.slim b/app/views/markdown/_area.html.slim
index 8d88295..3a392e6 100644
--- a/app/views/markdown/_area.html.slim
+++ b/app/views/markdown/_area.html.slim
@@ -7,18 +7,19 @@
 .markdown-area
   ul.nav.nav-tabs
     li.active
-      a href="##{write_pane_id}" data-toggle="tab" Write
+      a href="##{write_pane_id}" data-toggle="tab"
+        = t '.write'
     li
-      a href="##{preview_pane_id}" data-toggle="tab" data-behaviors="preview" Preview
+      a href="##{preview_pane_id}" data-toggle="tab" data-behaviors="preview"
+        = t '.preview'
   .tab-content
     .tab-pane.active id=write_pane_id
-      = form.text_area name, class: 'form-control', placeholder: 'Type here...', data: { behaviors: 'autosize' }, tabIndex: tabIndex
+      = form.text_area name, class: 'form-control', data: { behaviors: 'autosize' }, tabIndex: tabIndex
       .file-upload
         = file_field_tag :file, multiple: true
         .text.text-muted
-          | Attach images by
+          = t '.attach_images_by'
           '
-          a selecting them
-          | .
+          a = t '.select_them'
     .tab-pane id=preview_pane_id
       article.preview
diff --git a/app/views/notifications/index.html.slim b/app/views/notifications/index.html.slim
index 8cb62b8..bd01f42 100644
--- a/app/views/notifications/index.html.slim
+++ b/app/views/notifications/index.html.slim
@@ -3,16 +3,19 @@
     .panel
       .panel-body
         .btn-group
-          a.btn.btn-default href=mark_notifications_path data-remote="true" data-method="post" Mark all as read
+          a.btn.btn-default href=mark_notifications_path data-remote="true" data-method="post"
+            = t '.mark_all_as_read'
           a.btn.btn-default.dropdown-toggle data-toggle="dropdown"
             i.fa.fa-caret-down
           ul.dropdown-menu
             li
-              a href=clear_notifications_path data-remote="true" data-method="delete" data-confirm="Are you sure you want to clear notifications?" Delete all notifications
+              a href=clear_notifications_path data-remote="true" data-method="delete" data-confirm=t('.are_you_sure_you_want_to_delete_all_notifications')
+                = t '.delete_all_notification'
   .col-md-9.col-md-pull-3
     .panel.panel-campo
       .panel-heading
-        h3.panel-title Notifications
+        h3.panel-title
+          = t '.notifications'
       .panel-body
         ul.list-group.list-group-campo
           - @notifications.each do |notification|
diff --git a/app/views/notifications/notification/_comment.html.slim b/app/views/notifications/notification/_comment.html.slim
index 5b44086..a51e477 100644
--- a/app/views/notifications/notification/_comment.html.slim
+++ b/app/views/notifications/notification/_comment.html.slim
@@ -11,7 +11,7 @@ li.list-group-item.notification id="notification_#{notification.id}" class=('rea
       .list-group-item-heading
         b = comment.user.name
         '
-        | commented on
+        = t '.commented on'
         '
         b = comment_title(comment)
         '
diff --git a/app/views/notifications/notification/_mention.html.slim b/app/views/notifications/notification/_mention.html.slim
index 84f01a8..789f5e9 100644
--- a/app/views/notifications/notification/_mention.html.slim
+++ b/app/views/notifications/notification/_mention.html.slim
@@ -11,7 +11,7 @@ li.list-group-item.notification id="notification_#{notification.id}" class=('rea
       .list-group-item-heading
         b = comment.user.name
         '
-        | mentioned you on
+        = t '.mentioned you on'
         '
         b = comment_title(comment)
         '
diff --git a/app/views/sessions/new.html.slim b/app/views/sessions/new.html.slim
index 35c6abb..f17fa7d 100644
--- a/app/views/sessions/new.html.slim
+++ b/app/views/sessions/new.html.slim
@@ -3,7 +3,7 @@
     .panel.panel-campo
       .panel-heading
         h3.panel-title
-          | Sign in
+          = t '.sign_in'
       .panel-body
         = form_tag login_path
           = render 'share/flash_messages'
@@ -13,4 +13,4 @@
           .form-group
             = label_tag :password
             = password_field_tag :password, nil, placeholder: 'Your password', tabindex: 4, class: 'form-control'
-          = submit_tag 'Sign in', class: 'btn btn-success', tabindex: 5
+          = submit_tag t('.sign_in'), class: 'btn btn-success', tabindex: 5
diff --git a/app/views/subscriptions/_subscription.html.slim b/app/views/subscriptions/_subscription.html.slim
index bd0a7db..3050998 100644
--- a/app/views/subscriptions/_subscription.html.slim
+++ b/app/views/subscriptions/_subscription.html.slim
@@ -4,19 +4,19 @@
     - if subscription.nil?
       i.fa.fa-eye
       '
-      | Watch
+      = t '.watch'
       '
       i.fa.fa-caret-down
     - elsif subscription.subscribed?
       i.fa.fa-eye-slash
       '
-      | Unwatch
+      = t '.unwatch'
       '
       i.fa.fa-caret-down
     - elsif subscription.ignored?
       i.fa.fa-ban
       '
-      | Stop ignoring
+      = t '.stop_ignoring'
       '
       i.fa.fa-caret-down
   ul.dropdown-menu.dropdown-menu-subscription
@@ -25,20 +25,19 @@
         .subscription-status
           i.fa.fa-check
         .subscription-description
-          label Not Watching
-          p You only receive notifications if you are @mentioned
+          label = t '.not_watching'
+          p = t '.you_only_receive_notifications_if_you_are_mentioned'
     li class=('selected' if subscription && subscription.subscribed?)
       a href=polymorphic_url([subscribable, :subscription], status: 'subscribed') data-remote="true" data-method="put"
         .subscription-status
           i.fa.fa-check
         .subscription-description
-          label Watching
-          p You will receive notifications for all comments.
+          label = t '.watching'
+          p = t '.you_will_receive_notifications_for_all_comments'
     li class=('selected' if subscription && subscription.ignored?)
       a href=polymorphic_url([subscribable, :subscription], status: 'ignored') data-remote="true" data-method="put"
         .subscription-status
           i.fa.fa-check
         .subscription-description
-          label Ignoring
-          p You do not receive any notifications.
-
+          label = t '.ignoring'
+          p = t '.you_do_not_receive_any_notifications'
diff --git a/app/views/topics/_form.html.slim b/app/views/topics/_form.html.slim
index cbf34ec..c0d5cd6 100644
--- a/app/views/topics/_form.html.slim
+++ b/app/views/topics/_form.html.slim
@@ -5,13 +5,13 @@
         = f.text_field :title, class: 'form-control', placeholder: 'Title', tabIndex: 1
     .col-md-3
       .form-group
-        = f.collection_select :category_id, Category.order(topics_count: :desc), :id, :name, { prompt: 'No category' }, class: 'form-control', tabIndex: 2
+        = f.collection_select :category_id, Category.order(topics_count: :desc), :id, :name, { prompt: t('.no_category') }, class: 'form-control', tabIndex: 2
   .form-group
     = markdown_area f, :body, tabIndex: 3
   - if topic.new_record?
-    = f.submit 'Add this topic', class: 'btn btn-success', tabIndex: 4
+    = f.submit t('.create_topic'), class: 'btn btn-success', tabIndex: 4
   - else
-    = f.submit 'Save changes', class: 'btn btn-success', tabIndex: 4
+    = f.submit t('.save_changes'), class: 'btn btn-success', tabIndex: 4
     '
     a.btn.btn-default href=topic_path(@topic) tabIndex="5" Cancel
 
diff --git a/app/views/topics/_sidebar_search.html.slim b/app/views/topics/_sidebar_search.html.slim
index 564e46f..af6cad4 100644
--- a/app/views/topics/_sidebar_search.html.slim
+++ b/app/views/topics/_sidebar_search.html.slim
@@ -2,7 +2,7 @@
   .panel-body
     = form_tag search_topics_path, method: 'get', class: 'search-form', data: { behaviors: 'turboform' } do
       .input-group
-        = text_field_tag :q, params[:q], class: 'form-control', placeholder: 'Search', tabIndex: 1, autocomplete: 'off', autofocus: params[:q].present?
+        = text_field_tag :q, params[:q], class: 'form-control', placeholder: t('.search'), tabIndex: 1, autocomplete: 'off', autofocus: params[:q].present?
         .input-group-btn
           button.btn.btn-default type='submit' tabIndex="2"
             i.fa.fa-search
diff --git a/app/views/topics/edit.html.slim b/app/views/topics/edit.html.slim
index 699ad0c..cbef47f 100644
--- a/app/views/topics/edit.html.slim
+++ b/app/views/topics/edit.html.slim
@@ -12,6 +12,7 @@
           li
             a href=topic_path(@topic)
               = @topic.title
-          li.active Edit
+          li.active
+            = t '.edit'
       .panel-body
         = render 'form', topic: @topic
diff --git a/app/views/topics/index.html.slim b/app/views/topics/index.html.slim
index 8361f77..7b037cc 100644
--- a/app/views/topics/index.html.slim
+++ b/app/views/topics/index.html.slim
@@ -6,22 +6,22 @@
           ul.nav.nav-pills
             li class=('active' if params[:tab] == 'hot')
               a href=url_for(tab: 'hot')
-                | Hot
+                = t '.hot'
             li class=('active' if params[:tab] == 'newest')
               a href=url_for(tab: 'newest')
-                | Newest
+                = t '.newest'
         - if @category
           ol.breadcrumb.panel-title
             li
               a href=topics_path Topics
             li.active = @category.name
         - else
-          h3.panel-title Topics
+          h3.panel-title = t '.topics'
       .panel-body
         .list-group.list-group-campo
           - if @topics.empty?
             .list-group-item.text-center.text-muted.empty-message
-              | No topic yet.
+              = t '.no_topic_yet'
           - else
             = render @topics
       - if @topics.total_pages > 1
@@ -32,7 +32,8 @@
     = render 'sidebar_search'
     .panel.panel-campo
       .panel-body
-        a.btn.btn-success.btn-block href=new_topic_path(category_id: @category.try(:slug)) Create Topic
+        a.btn.btn-success.btn-block href=new_topic_path(category_id: @category.try(:slug))
+          = t '.new_topic'
 
     .panel.panel-campo
       .panel-body
@@ -40,7 +41,7 @@
           li class=('active' unless @category)
             a href=topics_path
               span.pull-right = Topic.no_trashed.count
-              | All topics
+              = t '.all_topics'
           - Category.order(topics_count: :desc).each do |category|
             li class=('active' if @category == category)
               a href=categoried_topics_path(category_id: category.slug)
diff --git a/app/views/topics/new.html.slim b/app/views/topics/new.html.slim
index 9bea039..ebda4d2 100644
--- a/app/views/topics/new.html.slim
+++ b/app/views/topics/new.html.slim
@@ -9,7 +9,8 @@
             li
               a href=categoried_topics_path(category_id: @topic.category.slug)
                 = @topic.category.name
-          li.active New Topic
+          li.active
+            = t '.new'
 
       .panel-body
         = render 'form', topic: @topic
diff --git a/app/views/topics/show.html.slim b/app/views/topics/show.html.slim
index c1ffc73..630c4e0 100644
--- a/app/views/topics/show.html.slim
+++ b/app/views/topics/show.html.slim
@@ -4,7 +4,8 @@
       .panel-heading
         ol.breadcrumb.panel-title
           li
-            a href=topics_path Topics
+            a href=topics_path
+              = t '.topics'
           - if @topic.category
             li
               a href=categoried_topics_path(category_id: @topic.category.slug)
@@ -36,17 +37,18 @@
                         = @topic.likes_count
                   a.btn data-visible-to="creator" href=edit_topic_path(@topic)
                     i.fa.fa-pencil
-                  a.btn data-visible-to="creator" href=trash_topic_path(@topic) data-remote="true" data-method="delete" data-confirm="Are you sure you want to delete this topic?"
+                  a.btn data-visible-to="creator" href=trash_topic_path(@topic) data-remote="true" data-method="delete" data-confirm=t('.are_you_sure_you_want_to_delete_this_topic')
                     i.fa.fa-trash-o
 
     .panel.panel-campo#comments
       .panel-heading
-        h3.panel-title Comments
+        h3.panel-title
+          = t '.comments'
       .panel-body
         ul.list-group.list-group-campo id="comments-for-topic-#{@topic.id}"
           - if @comments.empty?
             li.list-group-item.text-center.text-muted.empty-message
-              | No comment yet.
+              = t '.no_comment_yet'
           - else
             = render @comments
       - if @comments.total_pages > 1
@@ -66,17 +68,17 @@
                   = form_for @topic.comments.new, url: topic_comments_path(@topic), remote: true do |f|
                     .form-group
                       = markdown_area f, :body
-                    = f.submit 'Add this comment', class: 'btn btn-success', tabIndex: 2
+                    = f.submit t('.add_this_comment'), class: 'btn btn-success', tabIndex: 2
           - else
-            | Your account is locked.
+            = t '.your_account_had_been_locked'
         - else
-          | Need
-          '
           a href=login_path Login
           '
-          | or
+          = t '.or'
           '
           a href=signup_path Sign up
+          '
+          = t '.to_comment'
   .col-md-3
     - if login?
       .panel.panel-campo
@@ -85,7 +87,7 @@
     .panel.panel-campo
       .panel-heading
         h4.panel-title
-          | Relate topics
+          = t '.related_topics'
       .panel-body
         .list-group.list-group-campo
           - more_like_this_topics = @topic.more_like_this.limit(5).records
@@ -95,8 +97,7 @@
                 = topic.title
           - else
             .list-group-item.text-center.text-muted
-              | No more topics
-
+              = t '.no_more_topics'
 
 - if login?
   - if @topic.liked_by?(current_user)
diff --git a/app/views/users/_profile.html.slim b/app/views/users/_profile.html.slim
index be282b4..cacd384 100644
--- a/app/views/users/_profile.html.slim
+++ b/app/views/users/_profile.html.slim
@@ -11,4 +11,4 @@
     .panel-footer.clearfix
       .pull-right
         a.btn.btn-default href=settings_profile_path
-          | Edit profile
+          = t '.edit_profile'
diff --git a/app/views/users/_sidebar.html.slim b/app/views/users/_sidebar.html.slim
index de7b19d..47f500f 100644
--- a/app/views/users/_sidebar.html.slim
+++ b/app/views/users/_sidebar.html.slim
@@ -2,8 +2,11 @@
   .panel-body
     ul.nav.nav-pills.nav-stacked
       li class=('active' if controller_name == 'topics')
-        a href=user_topics_path(username: user.username) Topics
+        a href=user_topics_path(username: user.username)
+          = t '.topics'
       li class=('active' if controller_name == 'comments')
-        a href=user_comments_path(username: user.username) Comments
+        a href=user_comments_path(username: user.username)
+          = t '.comments'
       li class=('active' if controller_name == 'likes')
-        a href=user_likes_path(username: user.username) Likes
+        a href=user_likes_path(username: user.username)
+          = t '.likes'
diff --git a/app/views/users/comments/index.html.slim b/app/views/users/comments/index.html.slim
index fb8e9ba..2850660 100644
--- a/app/views/users/comments/index.html.slim
+++ b/app/views/users/comments/index.html.slim
@@ -3,12 +3,13 @@
     = render 'users/profile', user: @user
     #comments.panel.panel-campo
       .panel-heading
-        h3.panel-title Comments
+        h3.panel-title
+          = t '.comments'
       .panel-body
         .list-group.list-group-campo
           - if @comments.empty?
             .list-group-item.text-center.text-muted.empty-message
-              | No comment yet.
+              = t '.no_comment_yet'
           - else
             = render @comments
       - if @comments.total_pages > 1
diff --git a/app/views/users/likes/index.html.slim b/app/views/users/likes/index.html.slim
index a89d89c..06ff116 100644
--- a/app/views/users/likes/index.html.slim
+++ b/app/views/users/likes/index.html.slim
@@ -3,12 +3,13 @@
     = render 'users/profile', user: @user
     #likes.panel.panel-campo
       .panel-heading
-        h3.panel-title Likes
+        h3.panel-title
+          = t '.likes'
       .panel-body
         ul.list-group.list-group-campo data-creator-id=@user.id
           - if @likes.empty?
             li.list-group-item.text-center.text-muted.empty-message
-              | No like yet.
+              = t '.no_like_yet'
           - else
             - @likes.each do |like|
               = render "users/likes/like/#{like.likeable_type.downcase}", like: like
diff --git a/app/views/users/new.html.slim b/app/views/users/new.html.slim
index 648880a..0d05419 100644
--- a/app/views/users/new.html.slim
+++ b/app/views/users/new.html.slim
@@ -3,7 +3,7 @@
     .panel.panel-campo
       .panel-heading
         h3.panel-title
-          | Sign up
+          = t '.sign_up'
       .panel-body
         = form_for @user, html: { id: 'new-user-form' } do |f|
           = render 'share/form_error_messages', form: f
@@ -19,7 +19,7 @@
           .form-group
             = f.label :password, class: 'control-label'
             = f.password_field :password, placeholder: 'Create a password', tabindex: 4, class: 'form-control'
-          = f.submit 'Create Account', class: 'btn btn-success', tabindex: 5
+          = f.submit t('create_account'), class: 'btn btn-success', tabindex: 5
 
       javascript:
         $('#new-user-form').validate({
diff --git a/app/views/users/topics/index.html.slim b/app/views/users/topics/index.html.slim
index b40a45c..3b82941 100644
--- a/app/views/users/topics/index.html.slim
+++ b/app/views/users/topics/index.html.slim
@@ -3,12 +3,13 @@
     = render 'users/profile', user: @user
     #topics.panel.panel-campo
       .panel-heading
-        h3.panel-title Topics
+        h3.panel-title
+          = t '.topics'
       .panel-body
         .list-group.list-group-campo
           - if @topics.empty?
             .list-group-item.text-center.text-muted.empty-message
-              | No topic yet.
+              = t '.no_topic_yet'
           - else
             = render partial: 'topics/topic', collection: @topics
       - if @topics.total_pages > 1
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 05afd59..f07421f 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1,5 +1,6 @@
 ---
 en:
+  create_account: Create account
   layouts:
     application:
       likes: Likes
@@ -8,3 +9,83 @@ en:
       sign_in: Sign in
       sign_up: Sign up
       topics: Topics
+  markdown:
+    area:
+      attach_images_by: Attach images by
+      preview: Preview
+      select_them: Select them
+      write: Write
+  notifications:
+    index:
+      are_you_sure_you_want_to_delete_all_notifications: Are you sure you want to
+        delete all notifications
+      delete_all_notification: Delete all notification
+      mark_all_as_read: Mark all as read
+      notifications: Notifications
+  sessions:
+    new:
+      sign_in: Sign in
+  subscriptions:
+    subscription:
+      ignoring: Ignoring
+      not_watching: Not watching
+      stop_ignoring: Stop ignoring
+      unwatch: Unwatch
+      watch: Watch
+      watching: Watching
+      you_do_not_receive_any_notifications: You do not receive any notifications
+      you_only_receive_notifications_if_you_are_mentioned: You only receive notifications
+        if you are mentioned
+      you_will_receive_notifications_for_all_comments: You will receive notifications
+        for all comments
+  topics:
+    edit:
+      edit: Edit
+    form:
+      create_topic: Create topic
+      no_category: No category
+      save_changes: Save changes
+    index:
+      all_topics: All topics
+      hot: Hot
+      new_topic: New topic
+      newest: Newest
+      no_topic_yet: No topic yet
+      topics: Topics
+    new:
+      new: New
+    show:
+      add_this_comment: Add this comment
+      are_you_sure_you_want_to_delete_this_topic: Are you sure you want to delete
+        this topic?
+      comments: Comments
+      no_comment_yet: No comment yet
+      no_more_topics: No more topics
+      or: Or
+      related_topics: Related topics
+      to_comment: To comment
+      topics: Topics
+      your_account_had_been_locked: Your account had been locked
+    sidebar_search:
+      search: Search
+  users:
+    comments:
+      index:
+        comments: Comments
+        no_comment_yet: No comment yet
+    likes:
+      index:
+        likes: Likes
+        no_like_yet: No like yet
+    new:
+      sign_up: Sign up
+    profile:
+      edit_profile: Edit profile
+    sidebar:
+      comments: Comments
+      likes: Likes
+      topics: Topics
+    topics:
+      index:
+        no_topic_yet: No topic yet
+        topics: Topics
diff --git a/config/locales/zh-CN.yml b/config/locales/zh-CN.yml
index db56330..74fc56b 100644
--- a/config/locales/zh-CN.yml
+++ b/config/locales/zh-CN.yml
@@ -1,10 +1,87 @@
 ---
 zh-CN:
+  create_account: "创建帐号"
   layouts:
     application:
-      likes: 收藏
-      logout: 退出
-      settings: 设置
-      sign_in: 登录
-      sign_up: 注册
-      topics: 话题
+      likes: "收藏"
+      logout: "退出"
+      settings: "设置"
+      sign_in: "登录"
+      sign_up: "注册"
+      topics: "话题"
+  markdown:
+    area:
+      attach_images_by: "添加图片"
+      preview: "预览"
+      select_them: "选择文件"
+      write: "编辑"
+  notifications:
+    index:
+      are_you_sure_you_want_to_delete_all_notifications: "你确定要删除所有通知吗？"
+      delete_all_notification: "删除所有通知"
+      mark_all_as_read: "标记所有为已读"
+      notifications: "通知"
+  sessions:
+    new:
+      sign_in: "登录"
+  subscriptions:
+    subscription:
+      ignoring: "忽略"
+      not_watching: "未关注"
+      stop_ignoring: "停止忽略"
+      unwatch: "不关注"
+      watch: "关注"
+      watching: "关注中"
+      you_do_not_receive_any_notifications: "你不会收到任何通知"
+      you_only_receive_notifications_if_you_are_mentioned: "你只会在被提及的时候收到通知"
+      you_will_receive_notifications_for_all_comments: "每当有新评论时你都会收到通知"
+  topics:
+    edit:
+      edit: "编辑"
+    form:
+      create_topic: "创建话题"
+      no_category: "不分类"
+      save_changes: "保存修改"
+    index:
+      all_topics: "所有话题"
+      hot: "热门"
+      new_topic: "新话题"
+      newest: "最新"
+      no_topic_yet: "还没有话题"
+      topics: "话题"
+    new:
+      new: "新建"
+    show:
+      add_this_comment: "添加评论"
+      are_you_sure_you_want_to_delete_this_topic: "确认删除这个话题？"
+      comments: "评论"
+      no_comment_yet: "还没有评论"
+      no_more_topics: "没有更多话题"
+      or: "或"
+      related_topics: "相关话题"
+      to_comment: "后发表评论"
+      topics: "话题"
+      your_account_had_been_locked: "你的帐号已被锁定"
+    sidebar_search:
+      search: '搜索'
+  users:
+    comments:
+      index:
+        comments: "评论"
+        no_comment_yet: "还没有评论"
+    likes:
+      index:
+        likes: "收藏"
+        no_like_yet: "还没有收藏"
+    new:
+      sign_up: "注册"
+    profile:
+      edit_profile: "编辑个人资料"
+    sidebar:
+      comments: "评论"
+      likes: "收藏"
+      topics: "话题"
+    topics:
+      index:
+        no_topic_yet: "还没有话题"
+        topics: "话题"
diff --git a/lib/tasks/i18n.rake b/lib/tasks/i18n.rake
new file mode 100644
index 0000000..25fe64b
--- /dev/null
+++ b/lib/tasks/i18n.rake
@@ -0,0 +1,4 @@
+namespace :i18n do
+  desc 'update locales, remove unused'
+  task :update => ['i18n:add_missing', 'i18n:fill:blanks', 'i18n:remove_unused']
+end