We offer minimal support for right-to-left languages.
Essentially the letters should be displayed in the right order, and you should be able to type text easily.
There are a couple things that are not properly supported yet:
Bi-directional text is displayed properly, but editing it is cumbersome. As a workaround you should be able to copy-paste text from a different editor.
Languages with ligatures spanning over more than 2 characters are not using the right characters. Typically arabic letters won't use the correct ligatures. In the meantime, you can use a tool like this to convert your text. If you use such a tool, make sure to force the text direction to be left-to-right, as those tools only work in such a setting.
We'll be working on improving support for right-to-left languages, don't hesitate to reach out if you have feedback or questions about it!