How to make google actions with multiple languages?

For Alexa I have created an app with two languages, and this works well.

With Google Actions, I did the same thing, creating a project in 2 languages, but Voceflow does not manage multilingual uploads to google.

How can I manage an application in multiple languages?

have never tried but seems you can choose only one language in Voiceflow’s language setting for google.

IMO, multiple languages needs separate skill/action description for certification. but Voiceflow’s skill/action description page does not support this and has only one form. So, skill/action might works in development, but I don’t know how to submit and to be certified.