Lock execution to user language - allows you to lock execution of the protected module to a user country. Select possible countries to execute the module. If the module is executed in a non-selected country, an alert message will be shown (if the "Show message before termination" option is enabled) or the module will be terminated silently;
Select all - select all items in the countries list;
Unselect all - deselect all items in the countries list;
Invert selection - invert selection of all items, i.e. deselect all selected items and vice versa.
Show Message before termination - with this option enabled, the user will be notified in case the module isn't executed due to the user language lock. To edit the message, press "Design Message" button. If this option is disabled, the execution will be terminated without notification.