Lets try to change first the theme.html file.
locate the theme.html file in
themes/[name of theme]/theme.html
as you can see in previous post inside the file u will find something like this
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252" />
<meta http-equiv="Content-Language" content="en" />
you must change that to
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1253" />
<meta http-equiv="Content-Language" content="el" />
then save the file , delete all the files in folder templates_c and try again if u can see greek. in other way give me a private message . by the way i cannot reach your website.
makis