Thank you for setting this up. I had tried to install the Greek OpenOffice dictionary without success.
The Greek dictionary in the git works to the extent that it underlines properly, but it doesn't suggest corrections when you right click on a misspelled word. What I did by way of installation is to copy the Greek.* files to my User directory, restarted subl, then switched the dictionary in my Preferences to it. I suspect something's up with the dictionary, because I get spelling recommendations for the English dictionaries that are installed by default. Any ideas?