[Cooker] install user : "accept' button not very well placed.

[Christophe Combelles]

This is a matter of ergonomics :

During install, when new users can be added, the button "accept" (a user) should be placed at the right of the text fields, or just below them.

The current place for this button is not correct, because after having entered the username, name and passwords, one may click on the "done" button to confirm this user. Then the user will in fact not be installed, because the correct button was "accept" and not "done".

These two buttons are too close one from each other and should be better separated.