Google Code-in

Our phabricator task: https://phabricator.wikimedia.org/T118851

The success message on Special:PasswordReset doesn't differ between a user that requested a new password using an e-mail address and a user that does the same using a username. This should be fixed to show an appropriate message for both cases.

Please add Florianschmidtwelzow as a reviewer in Wikimedia Gerrit to conversion patches and feel free to ask him if something is unclear, some documentation is missing, etc.