Or you can make a translation mod. I've seen people ask for adding this and that language (but Persian is not the only "big" language missing -- there isn't e.g. Arabic or Hindi, either), so I don't know if there is any hope of getting more official languages.
Now I cannot find from Nexus lists, but I know at least Bahasa Indonesia and Ukrainian as translations. And I'm making the Finnish one. Publishing it as a mod (puuh, I'm "gathering strength" to start the 1.6. update. The game contains the same amount text as a novel. Add the messy json-files where the stuff must be put...
I know some people have been discussing the Arabic translation (I'm thinking of the problem of font and wriiing direction). Search for "Arabic".
And there was just a month ago someone else: