Dear sir,
AFAIK I am an available Greek translator. It is a bit weird that Faidon is not aware of this. Perhaps he is not familiar with the Debian-installer greek localization efforts either, otherwise he would know that.
Please feel free to translate Greek to Greek. If you, in any time, need a Greek-Greek dictionary to assist you in the translation process, I'm more than willing to donate one to Phaedon in order to feed it to you.