Anyone?Is it possible that I'm the only one with this issue?I installed osTicket on another server for testing and i have the same issue.

@[deleted]My answer has not changed from Feb 2015 which reads: "My understanding is that you have to do that at time of install, and

that there is no way to change if afterwards with out re-installing. 

Remember the Multilanguage feature is not done and ready at this time."You haven't told anyone what version you are running.  Each user has language settings also that would need to be changed after they log in to their preferred language.  Guests always default to the browser language, I do not think that this is changeable on the osTicket side.

Sorry I thought I did write the version number.It's v1.9.12.I would not make any sense if one could not change the system language AFTER the install.Why would that variable be in 'ost_config' table?Sure, users can change language for themselves but guests always have English, unless they have their browsers in language other than English. 

Okay let me put it to you differently..  The multi-language feature is not done/finished/completed and most probably never be in that version of osTicket.

i can solve it by edit this line in client.inc.php file, line 50. only add else statement:if (isset($_GET) && $_GET) {    if (Internationalization:($_GET))        $_SESSION = $_GET;}else{ $_SESSION = 'fa';}