This update to the To-Do List Plugin includes an updated Spanish translation by Ricardo, a bug fix involving multiple individual lists, and a change to the way the shortcode and widget display individual lists. If a user is logged in, they will see their own list using the shortcode or widget. Non-logged in users currently see all items. I plan to add a setting to the widget soon where you can choose what shows to non-logged in users.
Also, some of the text in the plugin has been reported as being unable to translate. I’ve looked through my code, but can’t see why that’s so. If you have any experience in this matter and want to help, please take a look at the code.