Template file language switcher on entry-content only (Genesis)

english.php

<?php
/**
 * Template Name: English page
 * Adds lang=en to the entry-content div only
 *
 * @package Genesis\Templates
 * @author  Rian Rietveld
 * @license GPL-2.0+
 */

add_filter( 'genesis_attr_entry-content', 'oogv_lang_attr_content' );

genesis();

function oogv_lang_attr_content($attributes) {

	$attributes['lang'] = 'en';
	return $attributes;
}