The details about how to translate the software would be something Hezul has to answer, although he's been inactive for a while, so don't get your hopes up.
Translating a project itself, well, that was basically the combined power of using Google Translate, context, common sense and playtesting. Database was easy enough for the most part, but it took me a bit to realize that a good number of strings are saved as a script (luckily, the scripts aren't protected or encrypted, so easy edits with a Java editor are possible).
To be honest, though, it's not that hard to learn 85% of SRPG Studio with some help from the Google Translate'd online help. The finer details will result in headscratching, but, hey, I managed to create a Weapon Triangle within the Weapon Type-tab and a Rescue mechanic based on constition while auto-excluding mounted units, so most FE-typical stuff will be possible with ease.
Unless you want Reaver weapons