Move browser page title translations for users_controller to locale file for controllers

In https://github.com/otwcode/otwarchive/commit/4e35e9eebbe0fa8d1beb9a2d4c141efbfcd59592 , we changed some browser page titles for the users_controller and at the same time prepared them up for translation. Unfortunately, the English strings ended up in config/locales/views/en.yml . They should be in config/locales/controllers/en.yml instead, since the browser page title is set in the controller, not the view. Lets move them to the correct file.

Testing

1. Log in

2. Hi, username! > My Preferences > Change My User Name

   1. The browser page title should still be Change Username

3. Follow “Change Password”

   1. The browser page title should still be Change Password

4. Follow “Change Email”

   1. The browser page title should still be Change Email