Issue #2881884 by pk188, Devaraj johnson, vijaycs85, dawehner: Docblock of configFactory property in ControllerBase is wrong

Issue #2471593 by JeroenT, Devaraj johnson: Replace the use of entity_load_unchanged() in ImageAdminStylesTest

Issue #2576037 by unqunq, er.manojsharma, sdstyles, martins.kajins, Devaraj johnson, cilefen, Bojhan, Wim Leers: "Sorry" in user-facing errors violates the User Interface Standards