add custom element inside menu-element in wordpress

gistfile1.txt

add_filter('wp_nav_menu_items','add_language_select_to_footer_menu', 'icl_post_languages', 10, 2);

function add_language_select_to_footer_menu( $items, $args) {
    if( $args->theme_location == 'footer-menu' ){ // choose name of the menu to apply

        $menuID = 'footer';
        $primaryNav = wp_get_nav_menu_items($menuID);

        echo '<ul id="menu-footer" class="nav navbar-nav">';

        for ( $i = 0; $i < count($primaryNav); ++$i) {
            if($i == 4){ //choose element of the menu to apply
            echo '<li><a href="'.$primaryNav[$i]->url.'" title="'.$primaryNav[$i]->title.'">'.$primaryNav[$i]->title.icl_post_languages().'</a></li>';
            } else {
            echo '<li><a href="'.$primaryNav[$i]->url.'" title="'.$primaryNav[$i]->title.'">'.$primaryNav[$i]->title.'</a></li>';
            }
        }
        echo '</ul>';
    } else {
        return $items;
    }
}