Is it possible to display a language switcher in de beginning from menu?

It’s possible with a little “hack”, you can add this to your functions.php, works with “TwentyTen”, did not test with “Responsive 1.8.5” theme…

// adds the polylang language switcher at the beginning of the menu
function ov3rfly_nav_menu_items($items, $args) {
	global $polylang;
	$menu_lang = get_option('polylang_nav_menus');
	return isset($polylang) ?
		$polylang->the_languages(array_merge($menu_lang[$args->theme_location], array('menu' => 1, 'echo' => 0))) . $items : $items;
}
add_filter('wp_nav_menu_items', 'ov3rfly_nav_menu_items', 10, 2);

You can not switch this on and off via Polylang “Menus” settings, it will always be there if Polylang plugin is active.

Settings like “Displays flags” etc. from Polylang “Menus” settings are used.

The “hack” is based on code from polylang/include/core.php