Issue #3217357 by Anandhi K, jungle, Rinku Jacob 13, longwave: Replace occurrences of outdated text "Extending Drupal 8" and its link

Issue #2577407 by vulcanr, jhodgdon, Sagar Ramgade, snehi, brahmjeet789, Manjit.Singh, Tony-Mac, ressa, xjm, cilefen, sajosh, ifrik, Charles Belov, Bojhan, David_Rothstein, Gábor Hojtsy, tkoleary, longwave, NickDickinsonWilde, nishantkumar155, shell_cm, greta_drupal, YesCT: Action of uploading module/theme files should consistently be called "Add", not "Install"

Issue #2055851 by andypost, jungle, dawehner, Mac_Weber, sja112, borisson_, fietserwin, init90, Gábor Hojtsy, xjm, effulgentsia, tim.plunkett: Remove translation of exception messages

Issue #3074585 by mikelutz, alexpott, Berdir, Mile23, heddn, effulgentsia, Wim Leers: [Symfony 5] Replace app.root and site.path string services with container parameters

Issue #3002206 by jibran, longwave, truls1502, alexpott, NickWilde: Update the stable version of drupal/coder to ˆ8.3.1

Issue #2830239 by cebasqueira, imalabya, spitzialist, th_tushar, monta, benjifisher, faline, alexpott: Several URLs point to  Drupal 7 documentation pages instead of Drupal 8

Issue #2935255 by Jo Fitzgerald, kim.pepper, voleger, alexpott, martin107, jibran, catch: Remove all usages of drupal_get_message and drupal_set_message in core lib

Issue #2873696 by nvexler, wengerk, gido, Jo Fitzgerald, xjm: Add @internal to core classes, methods, properties to Form Classes

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #842620 by alexpott, hansfn, BondD, jurjenn, Skin, xjm, hitesh-jain, solidwebcode: Update manager can't install modules using FTP due broken FileTransferAuthorizeForm

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

Issue #2570355 by Sutharsan, stefan.r, kgoel, josephdpurcell, joelpittet, justAChris, dawehner, pfrenssen, pwolanin, David_Rothstein, catch: Replace remaining !placeholder and @placeholder with :placeholder for URLs

Issue #2568775 by dawehner, lauriii, alexpott, joelpittet, xjm: Replace remaining !placeholder for Non-URL HTML outputs only for $e->getMessage()

Issue #2042447 by David_Rothstein, joelpittet, stefan.r, SebCorbin, mpdonadio, steinmb, webchick, Cottser, miniwebs2, Vj, Gilbert Rehling, nuwe, yched, StuartJNCC, Fabianx, yktdan, herom: Install a module user interface does not install modules (or themes)

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2335659 by tim.plunkett, dawehner, effulgentsia, sun: Remove FormState ArrayAccess usage from core.

Issue #2308821 by tim.plunkett: Replace FormErrorInterface with $form_state->setErrorByName() and $form_state->setError().