Add mobile version in site settings

config/locales/en.yml

@@ -333,6 +333,7 @@ en:
     keywords: Site keywords
     keywords_help: ''
     language: Site language
+    mobile_version: Mobile version
     search: Site Search
     search_help: Please Enter the search argument for Google search.
     settings: Site setting

config/locales/zh_tw.yml

@@ -333,6 +333,7 @@ zh_tw:
     keywords: 搜尋關鍵字
     keywords_help: ''
     language: 網站語言
+    mobile_version: 手機版
     search: 網站搜尋
     search_help: 請輸入送交Google搜尋的參數
     settings: 基本設定