Issue #1998140 by dawehner, ParisLiakos, tim.plunkett: Remove backward compatible ControllerInterface.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

This reverts commit c4e52bb6.

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

Issue #1847768 by rootatwc, tim.plunkett, effulgentsia, Crell, Damien Tournoud: Remove ip_address().

Issue #1934738 by sun: Fixed Exception: Serialization of 'Closure' is not allowed in serialize() (line 154 of dblog.module).

Issue #1898060 by taslett, jenlampton, Cottser: Remove all (useless) theme functions from dblog module, so we don't have to convert to Twig.

Issue #1662974 by barraponto, droplet, Albert Volkman, nitvirus, roborn, David Hernández: Clean up css in dblog.

Issue #1858600 by sun: 'Filter log messages' details on Recent log messages page applies bogus floats.

Issue #1029460 by sun: Find a better hook than hook_init() for drupal_add_js() and drupal_add_css().

Issue #1168246 by sun, mgifford, Manuel Garcia, mbrett5062, ry5n, Everett Zufelt, nod_, aspilicious, deviantintegral, tim.plunkett: Freedom For Fieldsets! Long Live The DETAILS.

Issue #985360 by superspring, erikwebb: Fixed Inconsistent punctuation for user.module watchdog messages.

Issue #1276908 by jessebeach, nod_, moshe weitzman, lewisnyman, webchick: Fixed Administrative tables are too wide for smaller screens.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).

Issue #1493108 by marcingy, Mike Wacker, sun, kbasarab, Berdir, Rok Žlender, cosmicdreams, alexpott: Convert logging and error settings to configuration system.