chore: add a script to cleanup old translations (#1963)

locales/zh-TW.json

@@ -30,7 +30,6 @@
     "mutuals": "互相關注",
     "notifications_on_post_disable": "當 {username} 發布時，停止通知我",
     "notifications_on_post_enable": "當 {username} 發布時，通知我",
-    "notify_on_post": "{username} 發文時通知我",
     "pinned": "置頂的貼文",
     "posts": "貼文",
     "posts_count": "{0} 則貼文",
@@ -63,7 +62,6 @@
     "more": "更多",
     "next": "下一個",
     "prev": "上一個",
-    "previous": "之前的",
     "publish": "發布",
     "reply": "回覆",
     "reply_count": "{0}",
@@ -94,11 +92,6 @@
     "toggle_zen_mode": "切換禪模式"
   },
   "common": {
-    "confirm_dialog": {
-      "cancel": "取消",
-      "confirm": "確認",
-      "title": "你確定嗎？"
-    },
     "end_of_list": "清單到底了",
     "error": "錯誤",
     "in": "在",