RTL multisite wordpress

Hi,
I do in multisite WordPress now.
I want to change one site to Urdu language which it means in RTL WordPress

I changed the code like this :

set the WPLANG variable in your wp-config to the RTL language like this:
define (‘WPLANG’, ‘ur-PK’);

set in the \wp-content\languages\ur_PK.php as:
<?php $text_direction = “rtl”; ?>

but the final result is :
dashboard comes to RTL but the site is LTR…

what does wrong?