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Date formats cannot be localized in Drupal 8. There are 3 UIs that lie to you about supporting that, but none of them do.
1. The built-in UI allows you to assign the format to different languages, but not to have different config for the same machine.
2. There is a hidden secret, forgotten UI that allows you to "translate" the formats but then it overwrites the cross-language setting in 1.
3. Config translation has a tab on date formats to translate, but that would only contain the date format label.
Use config translation (module). If we mark the date format translatable in the schema, we can expose that on localize.drupal.org and config translation module will pick it up as well. We need to have it as a translatable type, but using an existing type like label would not allow to display a proper widget for it, so defining a new derivative type lets us display a good UI in config_translation.
User interface changes
None. The UI change will be
from the config_translation module is postponed on this
PASSED: [[SimpleTest]]: [MySQL] 59,662 pass(es). View
PASSED: [[SimpleTest]]: [MySQL] 59,138 pass(es). View