I think the idea is going to be along the lines of "let Dom manage the English version" (e.g. upload the xml file) and have an interface for selecting a language from a dropdown, which would then display on one side the English text and have an editable spot for the translation for that language.
At any point a translated file could be pulled down based on those entries.
Whether or not this would be an "anyone edit" or a "give specific users edit access to specific languages" I don't know.
In an ideal world, I'd have it automatically pull the xml file from the repository, then it would be editable in the same way the wiki is.
What you'd need a translation management software for exactly ? You want to make it "non-coder proof" ? Which features are you looking for ? What are the limitations you're facing which make you want php ? Do you have a database that you can use on your server ?
More important, when do you need that ? 'Cause it's been a while, but I have done some php before too.
The biggest thing we need it for is to allow for our community to easily collaborate and make translations of the games. Ideally, we'd want it to be able to allow multiple people to edit the same translation and keep a log of it, like the wiki does. The reason behind wanting it in PHP is the rest of the site is in PHP, and Python/Jboss doesn't play well with other systems. I've been having difficulty getting Django to work, which is a basic part of Python, and installing Wildfly is not the easiest of things to do, despite seeming pretty easy, though I suspect I'm just missing something obvious. We do have databases that can be used as needed.
As to when, its been on my list for a while now, but it is a really low priority overall. For the most part, it can be considered a little pet project of mine, like the IRC room was.
I might have found some software that will do what I want, but I still have to to test it, so I'll get back to everyone on that. Meanwhile, if you're interested, it can be seen at arcengames.com/dev.