Show title on notice dialog optional

Problem/Motivation

Since klaro v 0.7.21 the title for notice dialog is disabled per default but can be set via a config item (see changelog).

Proposed resolution

Add this option to Drupal module.

Remaining tasks

- adding option in settings form
- add title in settings form
- add option showNoticeTitle in processDrupalSettings()
- add class and css for visually hidden
- write update hook for config.
- add translation / localisation
- Set or delete aria-label, see #3483896 🐛 Broken ARIA reference Active

User interface changes

* Title will be shown or visually hidden.

API changes

No.

Data model changes

* New config item show Title.