Display validator error messages during Create Issue in the right way

If a workflow validator throws a WorkflowException or InvalidInputException during "Create Issue" the error message is displayed in a very ugly way:

The error message of a WorkflowException is displayed on top of the screen preceded by "An unknown exception occured executing Validator <validator-class>@1fd2f18: root cause: ".

The error message of a InvalidInputException is not displayed at all, but only a common error message is displayed.

Please change this behaviour to:
The error messages of WorkflowExceptions are displayed on the top and the InvalidInputExceptions are displayed next to the concerned field. And all without other error messages.