You can't use the editor on the English game... Lezard has only translated the editor itself into English, it will still only work with the Chinese and Japanese games.
Hi Lezard, first of all thank you for all of your hard work, it's very much appreciated. I'm interested on this translation but unfortunately I'm having troubles with ulozto. It doesn't matter what I try, I can't seem to download the file. Do you mind posting the translation on another server?