Hi,
your plugin is simple and great,
there is just one fail - it can not be translated using WPML...
I do NOT mean admin/system messages, those can be obviously translated through WPML Themes and Plugins translation.
I mean user-created field labels (and messages).
I've noticed you are using common wordpress post system - can you allow WPML to translate forms similary as posts (so I don't need to create form per each language)?