Problem/Motivation
When on a translated page, hit edit for a block. You'll get to edit the original text, not the translated text. The same applies also to any other kinds of configuration override, whether from settings.php or domain based or group based or time of day based or whatever. Not sure how could settings tray conceptually be ready for this, given the config system itself does not know either which parts of which config belong to which override source. It is clear though that for multilingual sites, the settings tray does not deliver on its promise and does not let you edit what you see (neither does it give you a way to find out where to edit that).
Screenshot from a site installed in English with https://simplytest.me/project/multilingual_demo/8.x-2.0
Proposed resolution
Don't know.
Remaining tasks
N/A
User interface changes
TBD
API changes
TBD
Data model changes
TBD