Add volunteer roles to department CSV

Requested via Slack.

uber/site_sections/dept_admin.py

@@ -3,7 +3,7 @@
 from datetime import timedelta
 
 from uber.config import c
-from uber.custom_tags import pluralize, yesno
+from uber.custom_tags import pluralize, yesno, readable_join
 from uber.decorators import all_renderable, ajax, check_dept_admin, csrf_protected, csv_file, department_id_adapter, \
     requires_dept_admin, site_mappable
 from uber.errors import HTTPRedirect
@@ -201,7 +201,7 @@ def dept_requests_export(self, out, session, department_id, requested_any=False,
     def dept_members_export(self, out, session, department_id, message='', **params):
         department = session.query(Department).get(department_id)
         headers = ['Name', 'Legal Name', 'Email', 'Phone Number', 'Emergency Contact',
-                   'Weighted Hours', 'Badge Status', 'Placeholder', 'Has Shifts']
+                   'Weighted Hours', 'Badge Status', 'Placeholder', 'Has Shifts', 'Roles']
 
         out.writerow(headers)
         for attendee in department.members:
@@ -210,7 +210,8 @@ def dept_members_export(self, out, session, department_id, message='', **params)
                    attendee.weighted_hours_in(department),
                    attendee.badge_status_label,
                    yesno(attendee.placeholder, 'Yes,No'),
-                   yesno(attendee.weighted_hours_in(department) > 0, 'Yes,No')]
+                   yesno(attendee.weighted_hours_in(department) > 0, 'Yes,No'),
+                   readable_join([role.name for role in attendee.dept_roles])]
 
             out.writerow(row)