Merge branch 'ui-improvements' into 'master'

management/templates/management/add_election.html

management/templates/management/add_session.html

management/templates/management/add_tokens.html

management/templates/management/add_voters.html

management/templates/management/import_csv.html

management/templates/management/index.html

management/templates/management/session.html

management/templates/management/session_settings.html

management/views.py

vote/templates/vote/application.html

vote/templates/vote/index.html

vote/templates/vote/spectator.html

vote/views.py