Issue #3295853: Remove all mapping for fields in entity_view_display.
Solves an issue with field formatters settings and third_party_settings for fields on entity_view_display configs. Before the fix, hidding a field in entity view mode by using partial split would cause error because settings and third_party_settings could not be fully removed.
Besides, language entity does not need to keep third_party_settings empty, so it also can be removed.
Edited by Oleksandr Kuzava