There is a very easy way to add google fonts that support Greek in your wordpress. Also you can add Open Sans again with Greek support
Open the functions.css file
add this code add the end of the page
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<?php
function add_google_fonts() {
wp_register_style(‘GoogleFonts’, ‘http://fonts.googleapis.com/css?family=Open+Sans&subset=latin,greek’);
wp_enqueue_style(‘GoogleFonts’);
}
add_action(‘wp_print_styles’, ‘add_google_fonts’);
?>
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Save the file.
Thats it!
You can see in Google fonts page what fonts support Greek and put the correct link for every font you like
tag: Ελληνικά google fonts – open sans στο wordpress