fix for 新聞與公告QA

1.8.新聞或公告的「檔案室」上傳圖片後再行編輯時，圖片無法正常顯示（但是可以正常被編輯調整並於前台顯示）
	2.add  上傳檔案大小限制: 3MB
	3.公告的發佈單位為何是顯示單位代碼：M00？應顯示發布單位

config/locales/en.yml

@@ -289,4 +289,7 @@ en:
   modal:
     close: Close
     preview: Preview
-    
+  sys:
+    not_previewable: "Preview not support"
+    limit_of_upload_file_size: "Upload file must be less than: %{best_size}"
+

config/locales/zh_tw.yml

@@ -508,3 +508,6 @@ zh_tw:
   modal:
     close: "關閉"
     preview: "預覽"
+  sys:
+    not_previewable: "不支援預覽"
+    limit_of_upload_file_size: "上傳檔案大小限制: %{best_size}"

config/routes.rb

@@ -140,7 +140,8 @@ Orbit::Application.routes.draw do
   }
   
   # routes for gridfs files
-  match "/gridfs/*path" => "gridfs#serve"
+  match "/gridfs/*path" => "gridfs#serve" 
+
   # match "/images/*path" => "gridfs#serve_images"
   # match "/admin/pages/images/*path" => "gridfs#serve_images"