Bengali Font Support

Hello,
First of all thank you so much for this plugin. It helps alot.
I am looking for a plugin that supports Bengali Fonts.
As it described:
https://github.com/mathjax/MathJax/issues/2426
However, I am unable to achive this.
In my site using this plugin $$x=\text{পঞ্চান্ন হাজার চারশ}$$ shows weird ? symbols.
Can you help me with this/
It will be a great help for me and for education.
Thanks in advance.