Hello,
So it seems I have a misunderstanding. I will clear a bit. Maybe you can help me now.
1. The data in the database from invoice that I gave the image is broken. So it is the problem in the database. When I create a new invoice with proper input to database, the arabic font is shown. It is both in Windows and Linux. So, in FA, there is no problem anymore.
2. I have a problem in displaying arabic. Even if I change the language to arabic, FA in my windows will only become RTL but the text will be still in english. I think there is some problem in loading the language po/mo file. Can you help me? There is no problem if the server in linux. I think maybe because arabic language support in Windows but I have installed it and it still not showing the arabic text.