Added jQuery-ui and DatePicker for BillingController, plus "locale" twig global var
Indentation level to two spaces instead of four
Adapt Billing twig templates to Bootstrap3
Adapt Terminal twig templates to Bootstrap3
Adapt Billing twig templates to Bootstrap3
Corrected behaviour for opening bs3 modals instead of foundation's
Moved modal from billing/index.html.twig to global modals template