add translations

Conflicts:
	app/assets/stylesheets/group_requests.css.scss
	app/views/group_requests/_form.html.haml
	app/views/group_requests/pwyc.html.haml
	app/views/group_requests/selection.html.haml
	app/views/group_requests/subscription.html.haml
change subject in email

Conflicts:
	app/mailers/invite_people_mailer.rb