Issue #2878556 by plach, matsbla, vijaycs85, Gábor Hojtsy, catch, gabesullice, effulgentsia, hchonov, hass, amateescu, xjm: Ensure that changes to untranslatable fields affect only one translation in pending revisions

Issue #2224761 by Gábor Hojtsy, alexpott, pfrenssen, effulgentsia, xjm, mlncn: Add a generic way to add third party configuration on configuration entities and implement for field configuration.