Which files do I have to translate? In which directory.
Having installed at the weekend for the first time I'm certainly no expert but from what I've been doing so far I'd say virtually every .php file has hard coded text in it unfortunately.
Even more unfortunate, text you may wish to change is in multiple files in multiple locations. For example, I wanted to change "Help Topic" to "Subject Matter". The string "Help Topic" is hard coded into:
include/class.topic.php
scp/helptopics.php
include/staff/helptopics.inc.php
include/staff/helptopic.inc.php
include/client/open.inc.php
I assume it's also somewhere in includes/fpdf as it shows on the PDF created if a ticket's printed and good chance I've missed it elsewhere too.
From what I can tell so far (and would love to be pointed in the right direction if I've missed something) there's no quick way to do it; just have to slowly track everything down. Also a very good chance that you'll have to redo it every time you upgrade in the future unless you use git ... and even then with the amount I've already changed around (not just text changes) I can see upgrades being very messy!
Still looks like it will do exactly what I want after I finish tweaking things; so kudos and thanks to the devs and contributors