Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.

Issue #1987124 by tim.plunkett, h3rj4n, dawehner: Convert filter_admin_format_page() and filter_admin_overview() to a Controller.

Revert "Issue #1987124 by tim.plunkett, h3rj4n, dawehner: Convert filter_admin_format_page() and filter_admin_overview() to a Controller."

This reverts commit af5478b8.

Issue #1987124 by tim.plunkett, h3rj4n, dawehner: Convert filter_admin_format_page() and filter_admin_overview() to a Controller.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1167144 by chx, catch, claudiu.cristea: Make cache backends responsible for their own storage.

Issue #788114 by quicksketch, David_Rothstein, sun, Wim Leers: Unprivileged users should only get one text format by default.

Issue #1053518 by agentrickard, sun: Add text format form should redirect to text format listing, not to a fresh add text format form.

Issue #1779026 by dagmar, tim.plunkett, sun, heyrocker: Convert Text Formats to Configuration System.