Show role description in user edit form

gas/locale/es/LC_MESSAGES/django.po

@@ -82,7 +82,7 @@ msgstr "Crear"
 
 #: gas/users/views.py:55
 msgid "Update user"
-msgstr "Actulizar usuario"
+msgstr "Actualizar usuario"
 
 #: gas/users/views.py:56
 msgid "User updated"

gas/sites.py

@@ -77,8 +77,8 @@ class GASSite(object):
     @property
     def role_choices(self):
         return [
-            (role, role)
-            for role in self._registry['roles']
+            (role, f"{role}: {description}")
+            for role, description in self._registry['roles'].items()
         ]
 
     def get_role_description(self, role):