Same problem here. No field to edit, except the word “signature”. Hope the author will fix it soon because it’s really useful to have a signature option for forms.
Yes Misplon, mine is by AppThemes. I have found a way to change the display language on the site. I used the “Edit” to make changes on WordPress and seemed working fine for me. Thank you for your reply!
@jekachka, there was no WPLANG in my wp-config.php either. I added define (‘WPLANG’, ‘zh_CN’) for Chinese language under one of those “define” line myself after I had opened my wp-config.php file in a text editor.