ui: avatar uploader

packages/ui-default/locales/en.yaml

@@ -63,3 +63,4 @@ user_logout: Logout
 user_lostpass: Lost Password
 user_register: Register
 wiki_help: Help
+You can also upload your avatar to Gravatar and it will be automatically updated here.: You can also upload your avatar to <a href="https://gravatar.com/">Gravatar</a> and it will be automatically updated here.

packages/ui-default/locales/zh.yaml

@@ -960,6 +960,7 @@ Write Your Comment: 发表您的评论
 Write Your Solution: 发表您的题解
 Year: 年
 You are not allowed to join the domain. The link is either invalid or expired.: 您无法加入该域，链接无效或已过期。
+You can also upload your avatar to Gravatar and it will be automatically updated here.: 你也可以将头像上传到 <a href="https://gravatar.com/">Gravatar</a>，本站的头像将自动更新。
 You can create your own training plans and share with others.: 您可以创建您自己的训练计划并且与他人分享。
 You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.: 该比赛已结束，您无法在比赛模式下递交该题目。您可以点击“在题库中打开”以普通模式查看和递交本题。
 You cannot submit for this problem because the homework's deadline is due.: 作业已超过截止时间，您无法递交本题目。