I have installed BuddyPress on a site in Persian, but the numbers still show up in Latin alphabet. It is not a theme-related issue because the numbers are still in Latin when I use the default theme. Is it a bug in BuddyPress or is it something that needs to be taken care of in some other way?
bluebird2 - this is a known bug, but I'm not sure if it's BuddyPress or bbPress' fault.
There's a bug ticket at http://trac.buddypress.org/ticket/1445
There is a plugin that fixes this issue of numbers for Arabic/Persian on WordPress:
http://wordpress.org/extend/plugins/wp-jalali/
This plugin also converts the calendar and decimal sign into Persian.
But there is no plugin for BuddyPress to do the same thing.