Bug fixes

#3039915: QuestionViewsData should use dependency injection

Readme.md and help adjustments.

Resolved issue #3032025: now the cascading deletion works on base fields too. Just set cascading_deletion settings as follow on own baseFieldDefinition static method:

->setSetting('cascading_deletion', ['enabled' => TRUE])

Better documentation of module

Used dependency injection instead of \Drupal::service()

- Do not execute views for every block. Add a service for cache views and results

Fix correct default language not always loading.

Fix correct default language not always loading.