nccu fix

config/locales/en.yml

@@ -298,6 +298,7 @@ en:
   sys:
     not_previewable: "Preview not support"
     limit_of_upload_file_size: "Upload file must be less than: %{best_size}"
+    preview_only_for_img: "Preview only supprt with file type:jpg,png,gif,bmp"
     can_not_display_due_to_no_context: "Can not display due to no context for English"
     module_page_lang_not_support: "We are sorry, this page is not available for English"
   search:

config/locales/zh_tw.yml

@@ -528,6 +528,7 @@ zh_tw:
   sys:
     not_previewable: "不支援預覽"
     limit_of_upload_file_size: "上傳檔案大小限制: %{best_size}"
+    preview_only_for_img: "預覽僅支援：jpg,png,gif,bmp...等圖片格式"
     can_not_display_due_to_no_context: "因為沒有中文版本，所以無法顯示"
     module_page_lang_not_support: "很抱歉，本頁沒有開放中文版本"
   object_disable: