Issue #2143519 by followup yched, swentel: Allow FieldInstance yml files to refer to the Field by field name rather than by field_uuid.
Issue #2161067 by chakrapani, Nick_vh: Advanced search with Language filter does not work.
Merge remote-tracking branch 'origin/8.x' into rest-url-patterns-2019123
Changed url() to getSystemPath() in test cases.