Override locale only one form


On a french language website, I need to define UK language only on 1 form.
There is a way to do this without a multilingual plugin ?

Gravity Forms uses the site language globally, using a different language per form is not a feature.

There are some third-party plugins for multi-language providing integration for Gravity Forms that you could try:

Gravity Forms Multilingual - WPML

Make Gravity Forms Multilingual with TranslatePress (Easy Tutorial)