How to translate the error message of form?

A last question : can we change within the code the language by default ?

When an error occurs now on the form (ie : empty field), the following message appears : "This field is required."

We'd like to have it in French.

Thank you in advance.

Yes it is possible to translate the error message by editing the "Form Warning" which is under "Form Settings". You may like to take a look at the following guide which should help you:   https://www.jotform.com/help/61-How-to-Change-Form-Warnings 

Hope this helps.

Do get back to us if you have any questions.

Perfect !

Thank you for your quick answer !