Designing for Multilingual Product

The audience wants, and expects, a fully relatable experience in which they are being spoken to as they should be spoken to. You don't want to turn off the audience that you are hoping to reach.

The content should all be changed, from the text to even, at times, the website's menu. Allow for as much flexibility as possible.

There may be a font that supports your needs in Farsi, but does it have a corresponding bold or italicized version '- and does it matter? Verifying all these components requires research.