UTF-8 Cyrillic problem

Hi there!

I use russian WP and your plugin. I try to embed file in my admin edit post page. When I push “Google Doc Embedder” button it shows popup with form and all Cyrillic letters are garbled.

I’ve added this line:
header('Content-type: text/html; charset=UTF-8');
at the very beginning of lib-eddialog.php file and the problem is gone.

https://www.ads-software.com/plugins/google-document-embedder/