Searched system for collective translation — there are several projects that are loaded for them language files, create the desired direction of translation, and anyone can help translate some lines of text.
* PHP (preferably as the main project for which it all thinks on it)
* good API (since the authorization is private)
* ability to add your own formats
* simplicity (both for users and administrators)
Earlier on habré recommended GlotPress
* code — horror: reviews cheeeeeeese little, most of the methods are written in a continuous block (without blank rows) — no desire to modify and maintain it.
Who that will advise?