ThemeCatcher

With this add-on, a form can be translated into multiple languages using WPML. Gone are the days of having duplicate forms for each language!
<h3>Features</h3>
Translate unlimited forms into other languages through WPML.
Deep integration
All user-facing strings are fully translatable, including all form settings, fields settings and validation error messages. Emails sent to users can also be translated, along with the confirmation (success) message shown after the form is submitted.
Advanced WPML compatibility
Compatible with both the String Translation workflow, and the Advanced Translation Editor.
Datepicker/timepicker support
Automatically converts the locale of the datepickers and timepickers into the current WPML language. The dates and times will be automatically formatted according to regional standards.
<blockquote>
Note: this plugin is a free add-on for the <a href="https://www.quform.com/" rel="nofollow ugc">Quform Premium WordPress Form Builder plugin</a>. For this plugin to function, Quform version 2.16.0 or later, WPML version 3.2 or later, and the WPML String Translation plugin must be installed.
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Quform WPML

Translate Quform forms into multiple languages using WPML.

Integrates with any of your Quform forms to automatically add contacts to your Mailchimp mailing list.
<h3>Features</h3>
Create unlimited integrations from Quform forms to Mailchimp.
Double opt-in
Send the contact an opt-in confirmation email when they subscribe to your list.
Merge fields
Save additional form data about the contact.
Groups
Choose the groups to add the contact to.
Conditional logic
Create rules to determine whether or not to run the integrations based on the values of form fields.
Permissions
Allow other user roles to manage integrations.
GDPR friendly
Use conditional logic to only add the contact to Mailchimp if they have given consent.
<blockquote>
Note: this plugin is a free add-on for the <a href="https://www.quform.com/" rel="nofollow ugc">Quform Premium WordPress Form Builder plugin</a>. Quform version 2.6.0 or later is required for this plugin to function.
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Quform Mailchimp

Easily add contacts to Mailchimp from Quform forms.

Quform WPML vs Quform Mailchimp