Implemented ordering for navbar items

uffd/invite/views.py

uffd/mail/views.py

uffd/navbar.py

uffd/role/views.py

uffd/rolemod/views.py

uffd/selfservice/views.py

uffd/services/views.py

uffd/user/views_group.py

uffd/user/views_user.py