Insert custom fields at user registration

index.php

<?php
/**
 * Plugin Name:	Custom user registration fields
 * Plugin URI:	http://yoda.neun12.de
 * Description:	Add custom fields to the user registration
 * Version: 	0.1
 * Author: 		Ralf Albert
 * Author URI: 	http://yoda.neun12.de
 * Text Domain:
 * Domain Path:
 * Network:
 * License:		GPLv3
 */

add_action( 'plugins_loaded', 'wp_custom_user_registration_fields', 10, 0 );


function wp_custom_user_registration_fields(){

	add_action(
		'admin_print_scripts-user-new.php',
		function (){

			wp_enqueue_script(
				'add_custom_user_registration_field',
				plugins_url( 'wp_curf.js', __FILE__ ),
				array( 'jquery' ),
				false,
				true
			);

			wp_enqueue_script( 'wp_curf_l10n' );

			wp_localize_script(
				'wp_curf_l10n',
				'wp_curf_l10n',
				array(
					'label'		=> _( 'Biographical Info' ),
					'description'	=> _( 'Share a little biographical information to fill out your profile. This may be shown publicly.' )
				)
			);

		}
	);

}

wp_curf.js

/**
 * jQuery part of Costum User Registration Field
 *
 *  @author		Ralf Albert
 *  @version	0.1
 */

jQuery( document ).ready(

    function($){

        var insertElements =
            '<tr class="form-field">' +
            '   <th scope="row"><label for="description">' + wp_curf_l10n.label + '</label></th>' +
            '   <td><textarea name="description" id="description" rows="5" cols="30"></textarea><br /><span class="description">' + wp_curf_l10n.description + '</span></td>' +
            '</tr>';

        $( '#createuser .form-table tbody' ).append( insertElements );

    }

);