Calder Forms Polylang example integration

cf-polylang.php

<?php
/**
 * Plugin Name: Caldera Forms Polylang
 * Version: 0.1
 * Author: Andrei Mondoc
 */

// register form and field translatable strings
add_action( 'admin_init', function() {

	// get forms
	$forms = Caldera_Forms::get_forms();

	// loop through forms
	array_map( function( $form ) {

		$form_group = $form['name'] . ' : ' . $form['ID']; // form group reference to filter based on form

		// register translatable form name
		pll_register_string( $name = 'Form name', $string_to_translate = $form['name'], $group = $form_group );
		// translate success message
		pll_register_string( 'Form name', trim( $form['success'] ), $form_group );		
		// add more form properties here

		// get form config
		$config = Caldera_Forms::get_form( $form['ID'] );

		// loop through form fields
		array_map( function( $field ) use ( $form, $form_group ) {

			// add some logic for html or select/radio/dropdown field types
			// note that $name is the field slug here
			// same field slugs will override existing ones
			// so might be a good idea to be consistent across form/field slugs
			// ie keep First name => first_name consistent acrross all forms 
			pll_register_string( $field['slug'], trim( $field['label'] ), $group = $form_group );


		}, $config['fields'] );


	}, $forms );

} );

// filter field config at render stage
add_filter( 'caldera_forms_render_get_field', function( $field, $form ) {

	// add logic for field types etc...
	// translate field label
	$field['label'] = pll__( trim( $field['label'] ) );

	return $field;

}, 30, 2 );

// translate form config at render stage
add_filter( 'caldera_forms_render_get_form', 'cf_translate_form_config', 30 );
// translate form setting at submit stage
add_filter( 'caldera_forms_submit_get_form', 'cf_translate_form_config', 30 );

function cf_translate_form_config( $form ) {

	// tranlate name
	$form['name'] = pll__( $form['name'] );
	// translate success message
	$form['success'] = pll__( trim( $form['success'] ) );

	return $form;

}