Improvement of alert message: Invalid property type alias

[idseefeld]

I created an Element Type document type with alias headline and added a property with alias headline.
When I try to save the document type, I get the following alert notification:

The API response detail contains a much more helpful information about the failure:

The failing attemp gets not logged.

I suggest the following:

1. Either show the response.detail instead of response.title, or response.detail in addition to response.title. This would require a change in frontend.
2. Or Change the response.title to response.detail in the API backend.
3. The API backend should log the failing attempt.