Hi akapar, could you help me out with this?
Modify oc-content/plugins/printpdf/template.php
On top of the file change
require_once('tcpdf/config/lang/eng.php');
to
require_once('tcpdf/config/lang/ara.php');
Also, on the same file change every "helvetica" to "aefurat" (this is the font, and should appear on SetFont("helvetica",.... I think that with those changes should "work". If that is "OK" for you, then, I will change the layout (orientation of text, margins,...) to fit completely to a rtl text style.
Thanks