Update dibspw.php

Only load overrides at checkout confirmation page when DIBS is selected, else it makes no sense.
Adding Norwegian laguage file
Issue #5 HMAC calculation failes
Changing files charset and translating Norwegian characters into HTML character entities, in order to make it work for both Latin1 and UTF-8 configured stores, without needing to re-save the file with right charset.
Redirecting back to payment selection on cancel, instead of taking the customer back to shopping cart, and thus forcing them to go through shipping etc. again.
Redirecting back to payment selection on cancel, instead of taking the customer back to shopping cart, and thus forcing them to go through shipping etc. again (cleanup: forgot removing some test code).
Just fixing a minor ordering bug for config options.
Fixing issue #7
A better solution for issue #5
Merge pull request #4 from zencartnorge/master

Update language file, adding Norwegian, fixing HMAC calculation issue.