By default Multi Language support
Currently, if you want to build a multi language form, you must replace labels by "Calculate fields", then use a lookup function to get the correct value into a SharePoint Translation List.
This method is only acceptable if you have a small quantity of field on your form, due each calculate field means a request to the list, so 200 labels means 200 request to the list --> PERFORMANCE HUGE ISSUE.
It would be great Nintex to support by default better multi language option integrated, like the "resource file" parameter in advance settings, allowing a single query to a file (XML?) containing all literals and translations.
Thanks for your suggestion.
I will update this idea if there are any updates to share.