add lang: nl + deprecate lang/_target

resources/lang/zh_TW/message.php

@@ -50,4 +50,18 @@ BODY,
         'subject' => '考核 :exam_name 結束時間變更',
         'body' => '你進行中的考核：:exam_name 的結束時間由 :old_end_time 變更為 :new_end_time。管理員：:operator，原因：:reason。',
     ],
+
+    'mail_dear' => "尊敬的",
+    'mail_you_received_a_pm' => "你收到了一條新短訊。",
+    'mail_sender' => "發送者	",
+    'mail_subject' => "主題	",
+    'mail_date' => "日期		",
+    'mail_use_following_url' => "你可以點擊",
+    'mail_use_following_url_1' => "來查看該短訊（你可能需要登錄）",
+    'mail_yours' => "",
+    'mail_the_site_team' => "%s網站",
+    'mail_received_pm_from' => "你有新短訊，來自",
+    'mail_here' => "這裏",
+    'msg_system' => "系統",
+    'msg_original_message_from' => "原短訊來自",
 ];