Profile page design rework

Page could have a design refresh to be a little more user-friendly.

To-do's:

• Split role and group handling into different tabs
• Add a "My Profile" tab with profile data display and links to handler tabs
• Rename tabs, tables, etc
• "Requests list" -> "Your pending requests"
• "No items found" -> Don't display empty table but a message "You don't have any pending request"