http://phpbbarabic.com/community/viewforum.php?f=14
Download the Prosilver theme customize for RTL here (this should work with any RTL language)
http://phpbbarabic.com/community/viewtopic.php?f=14&t=6
Notes. In the theme Folder there is a file called (arabic.css). This file is used to alter the fonts by using google fonts.
If you want to use different fonts head to google fonts and replace the fonts in the file with the ones you like.
https://fonts.google.com/
Enjoy
