Invenio-theme-tugraz

- setup: necessary because devs not released
- view: add route for rdm-search
- setup: relax upper pins
- add default-page for unhandled errors
- guard views/dashboard by `tugraz_authenticated`
- fix deprecated `before_app_first_request`

- overview: view publications only if permission

- ui: add banner to header

- translation: fix typo

- fix: error_handler gets 1 parameter