Issue #2827784 by maxocub, faline, cebasqueira, juancasantito, tstoeckler, Wim Leers, alexpott: LanguageSelectWidget should have options for which language types to show

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

Issue #2230637 by plach, fran seva, yched, swentel: Create a Language field widget and the related formatter