1. Click button 'Add' -> a new secret URL should show up.
2. Click button 'Save' -> no warning will show up any more.
3. The calendar icon will disappear, the help text for date and time input format: 'Use the format YYYY/MM/DD HH:MM' will display. This input format may change when you change the language.
4. Click X button (delete) -> a confirmation form will show up (see attached image).
Test cases for this bug:
Open this page view/urls.php of any view.
1. Click button 'Add' -> a new secret URL should show up.
2. Click button 'Save' -> no warning will show up any more.
3. The calendar icon will disappear, the help text for date and time input format: 'Use the format YYYY/MM/DD HH:MM' will display. This input format may change when you change the language.
4. Click X button (delete) -> a confirmation form will show up (see attached image).