Ask HN: How do you manage translations?

I have a few hundred English strings to translate. They include both labels and content. I am interested to know how HN gets their project strings translated.

- Is there a service that will let me host my strings?

- Any experience/opinion on crowd sourcing translations?

- Cost: The dedicated companies are quite expensive for a hobby project. Did you ever pay for translations? What is the cost model?

Thank you.