Finnish translation

Translation for Finnish users
Merge pull request #27 from mediaclinic/2.1

Finnish translation
BUGFIX: Permission check for viewing orders.
Merge branch '2.1' of git://github.com/frankmullenger/silverstripe-swipestripe into 2.1
removed obsolete reference to Product_Image object
Added OrderForm onBeforeProcess callback for extensions using the orderform submitted data
using Controller::join_links to join url generated by Order::Link() to avoid relying to trailing slashes