No translations for Persian language

Hi all. Translations for Persian language (`fa` and / or `fa-ir`) is not currently available neither in Quince nor in master. As leaner dashboard is set as default dashboard by tutor, it would be great to have translations for Persian as well. 

This issue was originally discussed in [this topic in the forum](https://github.com/openedx/frontend-app-learner-dashboard/pull/271)