Problem/Motivation
#2713587: NodeController::revisionOverview() shows no revisions if node has no translation for current language brought up again that we have a conflict between trying to show only translation-relevant content in places like admin listings, vs. showing people the full history of nodes. This is also a conflict between trying to maintain the original UX of translation sets from 6/7 vs. the field translation approach.
Overall I think the revision tab should show all edits to a node regardless of affected language. For example how else would you undo adding a translation except reverting to the revision just before? We could then have a per-language filter on the page to show only affected languages. Or two tab
Proposed resolution
1. Status quo
2. Show all revisions
3. Have an 'all revisions' tab
4. Show all revisions but have the option to filter by language
