Translating content within DX8 is possible, providing that the configuration steps have been completed.
For the Layout Canvas field to work with content moderation and translation you need to:
- Update Entity reference revisions to 1.6 or higher
- Update Drupal Core to 8.6 or higher
- Apply the latest patch from this Entity reference revisions issue #2961399: Support parallel translation forward revisions on untranslatable fields -- https://www.drupal.org/project/entity_reference_revisions/issues/2961399