Prefill Template name when creating a new template from Content Definitions

[microposmp]

Is your feature request related to a problem? Please describe.

When creating a new template from a content type or content part definition the template name is not prefilled. The name must follow certain rules for it to be matched when used.

When selecting Edit templates from a content definition.

The name is currently not prefilled if the template for the selected type or part doesn't already exist.

Describe the solution you'd like

Prefill the name when creating a new template override from a content type or content part definition. When new template is selected directly from the template list is should remain empty and have to be filled in manually.