add backend form append note and fix show image

config/locales/en.yml

@@ -4,6 +4,7 @@ en:
     add_new: Add New
     all_articles: All Articles
     announcement: Announcement
+    append_note: Suggest to input underside Link and File's annotation to show correct info in frontend
     approval_setting: Approval Setting
     approve_bulletin_fail: Approval Fail
     approve_bulletin_success: Approve Successfully
@@ -25,6 +26,8 @@ en:
     frontend:
       bulletins: Announcement front-end
       search_result: Search result
+    image: Cover image
+    image_note: The image will not show in content
     link_name: Link Name
     new_bulletin_category: New Bulletin Category
     picture: Cover Picture

config/locales/zh_tw.yml

@@ -4,6 +4,7 @@ zh_tw:
     add_new: 新建
     all_articles: 文章列表
     announcement: 公告
+    append_note: 以下之附加連結與檔案，為使前台顯示名稱，建議您輸入註解。
     approval_setting: 審核設定
     approve_bulletin_fail: 審核失敗
     approve_bulletin_success: 審核成功
@@ -27,6 +28,8 @@ zh_tw:
     frontend:
       bulletins: 公告前台
       search_result: 搜尋結果頁
+    image: 封面圖片
+    image_note: 此處上傳的圖片不會在公告內文出現
     link_name: 連結名稱
     new_bulletin_category: 新增公告類別
     picture: 刊頭圖片