We announced it a while back that we have a new API in beta that can help you translate to other languages:
Join Autodesk Machine Translation API Public Beta Today!
One advantage of this service is that it's trained on the translations we did, so its vocabulary should align with our products much better.
Therefore, if you have an add-in that you would like to make available in multiple languages then this might be the right tool for you.
You don't even have to create all the language versions in advance. You could use this API to translate the text resources only when requested by the customer.
It would also be possible to send out a notification to your team so they could double-check the translations and fix them if needed. Then make the final version available for future downloads.
I modified an existing Fusion add-in sample so that all the text resources are stored in a single file.
This way only one file needs to be translated to different languages.
https://github.com/autodesk-platform-services/aps-addin-translation