How to translate in Greek with the PhAB's Language Editor?

I’m hoping someone can help me…

I have designed a PUI structure and translated it into several latin languages with the PhAB application called “Languages Editor”. Now I would like to translate it into Greek. If it exists, could you tell me the procedure to obtain “greek” in the Language selection menu and to have the greek font related to this translation.

Otherwise, if I have to modify my PUI, what can I do to avoid complete duplication ?