[Translation] Add Persian/Farsi to org-export

[Sajad Hosseini Balef]

lisp/ox.el: Add Persian/Farsi to org-export

* Add Persian/Farsi translation to the org-export-dictionary variable at 
lisp/ox.el.
- Persian/Farsi is the native language to ~ 110 million speakers 
worldwide (mostly in Iran, Afghanistan, Tajikistan, Uzbekistan, and 
Iraq).
- "fa" abbreviation stands for "Farsi" according to [[ISO 
639-1][https://en.wikipedia.org/wiki/ISO_639-1]].
- the ```diff``` file and the ```patch``` are enclosed in the mail 
attachment.

Sincerely and Peace.

shosseinib

ox.el.diff
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ox.el
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