* Persian translation update

* fix newline typo

duplicates. Web UI regenerates UUID for that header every time the compose
form is changed or successfully submitted

Also, fix Farsi i18n overwriting the English one

Settings page contained labels in Persian, when I was using English.

* Persian translation

* adding :fa to make the site use the rtl stylesheet

based on [this comment](https://github.com/tootsuite/mastodon/pull/2405#issuecomment-296721105)

* fix missing quotes

* add 'fa' locale