Merge branch 'fix-gh-issue-9640' into 'master'

Fix HTML link that was improperly escaped in new user e-mail

### Before:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/e42e73f04971d8dd949b034846d2bb9f/image.png)

### After:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/90425911345031a4b8e9374323728f79/image.png)

Closes https://github.com/gitlabhq/gitlabhq/issues/9640

See merge request !1323