Problem/Motivation
Split from #2794431-121: [META] Formalize translations support. Postponed on #3199696: Add language support to ResourceObject.
Steps to reproduce
Proposed resolution
Remaining tasks
- Write tests
- Test suggestion: Test what happens when a header is sent with specific language to a canonical url which should return the default language.
- Address feedback #8 in https://www.drupal.org/project/drupal/issues/2794431#comment-13935684
User interface changes
None
API changes
Data model changes
None