We’re also keen to have an update on the progress of the development of this feature.
We recently built out the functionality described here, on a client site:
https://blog.hubspot.com/customers/removing-language-barrier-multi-language-module-hubspot-blogs
It took a lot of troubleshooting to get right and definitely felt like more of a workaround than the HubSpot translation functionality on the main website pages.
An update from HubSpot would be much appreciated!