samigo: Error message on trying to publish quiz with same available and due date

When you try to publish a quiz with the same date for available and due date, the save is blocked and you get the following error message:

[missing key (mre): org.sakaiproject.tool.assessment.bundle.AssessmentSettingsMessages due_same_as_available]

If you are to be prevented from publishing, the user needs to see a meaningful error message, for example:

The due date must be later than the available date.

Note: The save block is a behavior change from previous versions of Sakai. Tests & Quizzes never cared before if the available and due date were the same because it didn't cause any conflict, the quiz just was never available to students.