Complete the Norwegian Bokmål (Norsk Bokmål) translation of Puter

[AryanTavish]

Done with the translation and also optimized the billing section
Issue 857
#857

[CLAassistant]

All committers have signed the CLA.

[jelveh]

Thank you for contributing this translation!

One small issue to fix: The billing section is currently structured as an object (billing = { ... }), but it needs to be formatted as individual string keys like the English version, where each key follows the pattern 'billing.key_name'. This is important because using actual nested objects would cause issues with the translation system.

For example, instead of:

billing = {
    change_payment_method: "Endre",
    // ...
}

It should be:

'billing.change_payment_method': "Endre",
// ...

Could you update the billing section to match this format? Once that's fixed, the translation will be ready to merge. Thanks again for your contribution!

[AryanTavish]

sure thing! , updated the commit :)