Adding Persian Translations

Persian translations for pdf.js. Word equivalence is based on [Persian Academy](http://www.persianacademy.ir/fa/wordsSearch.aspx) and localization translations of [MediaWiki](http://translatewiki.net/wiki/Portal:Fa) and manual of style of [Persian Wikipedia](http://fa.wikipedia.org/wiki/%D9%88%DB%8C%DA%A9%DB%8C%E2%80%8C%D9%BE%D8%AF%DB%8C%D8%A7:%D8%AF%D8%B3%D8%AA%D9%88%D8%B1_%D8%AE%D8%B7) and [Persian Academy orthography guideline](http://www.persianacademy.ir/fa/das.aspx) is used.