Hi, @LO-BlackInk 
Unfortunately, it’s impossible to dynamically translate the widget elements (including form) based on the language of the conversation. However, this idea is already on the Wishlist and you can upvote it here - Multilanguage version for the widget elements
As for the custom form fields, this request is also posted on the Wishlist- Custom form fields (Text field, Choice, etc). At the moment, we don’t have the ETA for this feature, but if any news comes up, we’ll update you in the Wishlist thread 