Translation Apps and it's working with third-party-themes

[Kjankko-US]

Hi friends,

I'm trying to find the best translation App. So for have tried Translation Lab -App. 

Question:

- Does the Apps work with themes that are outside of Shopify, for example: Out of the sandbox and Archetype themes?

Asking this because the Translation Lab App doesn't show languages on themes that I haven't bought yet - just testing those themes so far.

Which Translation Apps have you used and does it work?

Thanks,

-KJ