Modifying entry notes

Is there a way to modify entry notes? For example, replace ‘WordPress’ with the ‘Site Name’? or the gravity froms icon with the sites icon?

I’m not seeing any easy way to filter the actual note content, but I do see an undocumented filter that should allow overriding the avatar – gform_notes_avatar which accepts two arguments – $avatar and $note. You can find it in entry_detail.php.