Currency Format Problem

[hmsj]

Hello

 

I am using prestashop 1.5.4.1 with arabic language and my shop currency is Riyal

The problme is that I can't show the currency in the right Format

I want to display it as (ريال word should be in the left hand side):

15000 ريال

 

From the backoffice

I went to localization then currencies and I tried to change the format but nothing is changed

I can change the fromat only when I type Riyal word in English

What is the reason for that ? and how can I change the format to what I want?