This reverts commit 5a9ce8cf.

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2453551 by mbovan, edurenye, Berdir, Saphyel, jhodgdon: TranslationLanguageRenderer tries to add langcode field to the view for entity types that have no langcode

Issue #2533964 by edurenye, Berdir, Gábor Hojtsy: Langcode widget visibility settings from language.module are not applied consistently