Issue #2152229 by steveoliver, rteijeiro, joelpittet, JeroenT, InternetDevels, michamilz, burgerboydaddy, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_textarea() to Twig

Issue #2181283 by mradcliffe: Prevent pgsql driver from trying to implode primary key fields that are defined by an array.

Issue #1857336 by Xano, swentel, Berdir, InternetDevels: Use entity variable in $build for taxonomy_term entity.

Issue #2152213 by steveoliver, joelpittet, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_form_element() to Twig

Issue #1987606 by vijaycs85, mparker17, InternetDevels, rdickert: Convert ajax_test_dialog() to a new style controller.

Issue #2078387 by Xano, andypost, twistor, splatio, InternetDevels, amateescu, Berdir, larowlan, vladan.me: Add an EntityOwnerInterface.

Issue #2176721 by maartendeblock, nod_: 'Back to site' button does not preserve URL's language prefix and querystring.

Issue #2182265 by Sweetchuck, nod_: Javascript file translations are several bugs away from working at all.

Issue #2110501 by tim.plunkett, pwolanin, tstoeckler: ControllerBase should implement ContainerInjectionInterface like FormBase.

Issue #2049573 by pcambra, damiankloip, tim.plunkett, dawehner: Move most or all of the ActionBulkForm class to BulkFormBase.

Issue #1069152 by droplet, alexandrezia, jhedstrom | ogi: Throbber in textfield is misaligned when browser hardware acceleration enabled (gfx).

Issue #2162729 by TravisCarden, Xano, InternetDevels: "Sub-class must implement the getInfo method" not a helpful exception message.

Issue #1928752 by mtift, jenlampton: Put all test modules into the 'testing' Fieldset on the modules page (file module).

Issue #2168011 by xjm, jessebeach, Damien Tournoud, znerol, Xano: Remove all 7.x to 8.x update hooks and disallow updates from the previous major version.

Issue #2176105 by sun: Installer catches exceptions and manually re-prints them; does not use error/exception handler.

Issue #2156649 by likin, amateescu: The 'entity_reference_autocomplete' widget doesn't handle multiple values correctly.