Multi Language WordPress htaccess

.htaccess

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

RewriteRule ^(br|en|es)$ index.php?lang=$0 [L,QSA]

RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

functions.php

<?php

function is_multilanguage_front_page()
{
    return ! empty($_GET) && ! empty($_GET['lang']) && in_array($_GET['lang'], array(
            "en",
            "es",
            "br"
        ));
}

function language_redirect($template)
{
    if (is_multilanguage_front_page()) {
        return locate_template(array('front.php'));
    } else {
        return $template;
    }
}

add_action('template_include', 'language_redirect');