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if you want to see them add a language, it would be best to post in the suggestion forum. that is the forum that the steam developers look thru for feedback, ideas and suggestions.
Farsi is long from being a supported language on Steam, if at all in the foreseeable future.
You can use Steam in Iran but physical gift cards/codes may not work in your country but being sent a digital Steam wallet card directly from one Steam account to another will work.