Basically,this is a problem of displaying a minority language.
Let me make it brief:
I\'ve been trying to make my Opentype font(which has some features
Which programming language do you use or you should use?
As you question tags, you may have a look at this (the second code), just do a sudo apt-get install python-gtk2 for it, ref
sudo apt-get install python-gtk2
A lightweight solution would be using HarfBuzz directly.