changing 'event' word to be configurable via settings

Conflicts:
	app/controllers/events_controller.rb
	app/views/event_mailer/approve.html.erb
	app/views/event_mailer/approve.text.erb
	app/views/event_mailer/awaiting_approval.html.erb
	app/views/event_mailer/awaiting_approval.text.erb
	app/views/event_mailer/cancel.html.erb
	app/views/event_mailer/cancel.text.erb
	app/views/event_mailer/change.html.erb
	app/views/event_mailer/change.text.erb
	app/views/event_mailer/coordinator_assigned.html.erb
	app/views/event_mailer/coordinator_assigned.text.erb
	app/views/event_mailer/unattend.html.erb
	app/views/event_mailer/unattend.text.erb
	app/views/events/edit.html.erb
	app/views/events/who.html.erb
	app/views/users/_form.html.erb