After importing and closing the window, we should see the user(s) imported

[ldubost]

After importing and closing the window, we end up on different screens depending on where we click on the import button. We need to make sure in each of these cases that we see the user(s) imported if they should be on these screens. In most cases it should be enough to reload the page.

More generally we should come back to where we were.

1/ If we open from a group edit in the admin section, we should come back to the edit group view and see the user imported in the livetablee
2/ If we open from group page in edit mode we should see the user imported

This is also related to #20 as the button placement is not always correct.