WPML Ninja Forms Multilingual Addon

Ninja Forms is an intuitive drag-and-drop form builder that helps you add front-end forms to your WordPress site in minutes. In this tutorial we walk you through the process of creating multilingual forms using Ninja Forms and WPML.

Demo Link : https://wpml.org/documentation/related-projects/creating-multilingual-forms-using-ninja-forms-and-wpml/

Summary from Demo
Ninja Forms is an intuitive drag-and-drop form builder for WordPress. Learn how to use WPML to create multilingual forms using Ninja Forms.
Form in the default language
Translated form
Start by installing and activating the following:
If you’re new to WPML check out our Getting Started Guide. It quickly walks you through all the translation options you can use.
One of these options is Translate Everything – the quickest way to translate and the easiest way to keep your content up to date. This feature automatically translates pages posts custom post types custom fields taxonomies WooCommerce products and more as you add and edit content.
Using Translate Everything with Ninja Forms will speed up the workflow of translating your forms.
These are the main steps to follow for translating your forms:
To create the default language form go to Ninja Forms → Add New. In this example we will use the “Contact Us” form template. Of course you can use a blank template and build your form from scratch.
To translate your form go to the WPML → Translation Management page and follow these steps:
You’re taken to the Advanced Translation Editor where you can translate your form. You can use the built-in automatic translation for quick and easy translation.
For the time being you can’t set your secondary language forms to have a different date format for the date field nor a different currency.
After creating and translating your form it is time to add it to a page post or widget. In our example we created a new page in English and used the Ninja Forms block to add our form.
Finally translate the page post or widget that includes your form. You can do this by clicking the plus icon corresponding to the language you want to translate your page into in the Language box.
If you change the form in the default language you need to update its translations as well.
To update the translation of a form follow these steps:
WPML works fine with this plugin but sometimes there could be minor issues we're working on. This is expected as both plugins provide frequent updates.
Current issues:
We have supporters in our forum who are ready six days a week to help you. They are trained in how to use WPML with Ninja Forms.
If you are setting up the site and WPML yourself please use our Technical support forum.