EVEN SIMPLER VERSION:
make 2 menus named en/tr
add _tr to slug of all pages belonging to tr
make code like this:
<a href="/wordpress/">EN</a> | <a href="/wordpress/aaaaaa_tr">TR</a>
aaaaaa_tr = first page of tr
add following lines to header instead of wp_nav_menu:
$m=”en”;
if (substr($_SERVER[‘SCRIPT_URL’], -4,3)==”_tr”) $m=”tr”;
wp_nav_menu( array( ‘menu’ => $m ) );
(if url ends with _tr, keep showing menu tr, else: en)
