There is only a greek language pack for 1.3.7 version.
I upgraded from 1.3.7.1 to 1.3.8. My old version had the greek language pack installed (Krom) and it seems that in the 1.3.8 version everything works ok with the greek. The only thing required is to re-add the mysql_query('SET NAMES "greek"', $this->link); line in the query_factory.php so the queries to the database output greek encoding results.
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