Another odd bug when trying to submit avatar url.

Image type JPEG is not allowed. Allowed types are: image/png, image/jpeg, image/gif

Given the image is a .jpg again it's same .jpeg

Validation problem with username/emails, during login.

I don't think the username/emails should be case-sensitive. For example if you registered as Demo and Demo@demo.localhost then you won't be able to login with demo or demo@demo.localhost

Silly validation bug if you ask me, but I'm a PHP guy so I don't know if Python & Flask are more anal on Validation of Forms Data.