[WIP] added toolbartemplate for homepage

- added toolbartemplate for homepage
- changed fallback for callbacks for toolbar to use default if none found

__Tasks:__

- [ ] test coverage
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | yes
| Fixed tickets | none
| Doc           | none