Bug fixes

Fixed issues:

• Translation import failure when it was requested for field config from field settings page (“File import failed with the following message: The “node_fields” entity type does not exist.”)

• Drupal 9 support

• Get base theme until core theme with block__system_branding_block template.

• Issue #3178371: Allow to translate error_message

Do not call validateReferenceableEntities() with an empty array

Make sure class always exists so the widgets are clickable.