support linking OAuth 2.0 user to logged-in users

src/locales/zh_Hant.json

@@ -1257,6 +1257,7 @@
         "cannot retrieve oauth2 token": "無法獲取 OAuth 2.0 令牌",
         "invalid oauth2 token": "無效的 OAuth 2.0 令牌",
         "cannot retrieve user info from oauth2 provider": "無法從 OAuth 2.0 提供者獲取使用者資訊",
+        "oauth2 user already bound to another user": "OAuth 2.0 使用者已綁定到另一個使用者",
         "query items cannot be blank": "查詢項目不能為空",
         "query items too much": "查詢項目過多",
         "query items have invalid item": "查詢項目中有非法項目",
@@ -2154,6 +2155,7 @@
     "Unable to clear user data": "無法清除使用者資料",
     "Third-Party Logins": "第三方登入",
     "Linked Time": "連結時間",
+    "Link": "連結",
     "Unlink": "取消連結",
     "Are you sure you want to unlink this login method?": "您確定要取消連結這個登入方式？",
     "Unable to retrieve third-party logins list": "無法取得第三方登入清單",