Steps to reproduce:

No title for error:

1. Navigate to Services->SLA
2. Create SLA
3. Submit empty form
4. Observe: No error title displayed

Error title displayed as one of the details (precondition: at least one problem must exist):

1. Navigate to Monitoring->Problems
2. Update problem (press on Yes/No in the Ack column for the problem)
3. Make sure you fail with exception from API in event.acknowledge
4. Try to update problem.
5. Observe: error title is displayed as one of the details 

Expected:
Error title and details in all frontend forms should be displayed as shown in the example below:

Note: This also affects Service form and possibly other forms throughout frontend.