Refactor Javascript

management/templates/management/add_election.html

management/templates/management/add_session.html

management/templates/management/application.html

management/templates/management/election.html

management/templates/management/index.html

management/templates/management/session.html

management/templates/management/session_settings.html

static/js/application.js

static/js/reload.js

vote/templates/vote/application.html

vote/templates/vote/base.html

vote/templates/vote/index.html

vote/templates/vote/spectator.html

vote/templates/vote/vote.html