USer/Group UI: align user variables for readability purposes

It would be great to at least align details of users in the User Management UI in the admin center (I think it is the same in the ACL picker or for the groups - to be checked). This is quite hard (and not very professional) to list users as now (cf screenshot).

Ideally speaking it would be great to replace such a input text form by a simple GXT powered column based widget. This would remove all this ugly sorting button and align the properties correctly. To verify if this takes less time to try to correct the old UI or to add a new GXT ready-to-use component instead.