add not found for no result

config/locales/en.yml

@@ -293,3 +293,5 @@ en:
     not_previewable: "Preview not support"
     limit_of_upload_file_size: "Upload file must be less than: %{best_size}"
 
+  search:
+    not_found: "NOT FOUND"

config/locales/zh_tw.yml

@@ -430,6 +430,9 @@ zh_tw:
     select:
       prompt: "請選擇"
 
+  search:
+    not_found: "沒有搜尋結果"
+
   activerecord:
     errors:
       template: # ~ 2.3.5 backward compatible