**Summary** When I try to change my email in notification settings for specific groups, it gives a 404 error. This is caused by the urls using `%2F` instead of a `/` (slash) (I confirmed this by using a curl and only editing the slashes in the url). **Steps to Reproduce** 1. https://gitlab.com/-/profile/notifications 2. Try to change your email for any groups you have (you need to have more than 1 email addresses) 3. 404