Create course by rtl language in swirl

I want to use swirl for my course, but my language is persian and it's rtl language. Now i use this language in swirl i get an error.
How can use rtl language ?

You might have better luck asking this question in the swirl GitHub repo, since it's pretty specific to the package.

thanks @mara
I have also asked this question there but have not received an answer :pensive:

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