Truncate product description when used as meta description

Fixes #2396
Fix jirafe admin settings styling

Fixes #2733
Move currnet_currency and ip_address helpers to ControllerHelpers::Order, where they're required
[frontend] tidy up let(:order) block in CheckoutController spec
Correct MailMethod usage in mail_interceptor, order mailer and shipment mailer specs
Added checked values for the radio_button_tag of currency_symbol. fixes #2755

Fixes #2756