osTicket v1.10 (stable) and Maintenance Release v1.9.15 are now available! Go get it now
If you want to make you own translation of the client-side without waiting for the final version with you locale, here's a list of the files you need to change.
Remember if you upgrade you installation all your translations are lost and you must do it all over again. My advice: keep a copy of your translated files somewhere else.
* check all files inside /include/client most of what needs translation are here
* class.forms.php and class.nav.php inside the /include folder - These are the menu bars and other stuff
* Go to the Administration section / Pages and Forms - all these need translation.
I think that's most of it.
Hope I could help