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

Issue #1987882 by disasm, vijaycs85, penyaskito, kim.pepper, likin, YesCT, InternetDevels, dawehner, wamilton, Letharion, katbailey, googletorp, tim.plunkett, acrollet, neetu morwani: Convert content_translation routes to a new style controller.