Issue #2361745 by rpayanm, javivf: Remove usage of truncate_utf8().
Issue #2361809 by rpayanm, nlisgo: Remove usage of drupal_strtoupper().
Issue #2282673 by stevepurkiss, ParisLiakos, mgifford: Add a PHPunit test for not using Drupal\Core code in Drupal\Component.
Revert "Issue #2358685 by Aleksandar_P | LewisNyman: Remove edit and configure icons from misc."

This reverts commit 39aeee85c2341287746506b726f378748056ba11.
Issue #1879930 by fran seva, Gábor Hojtsy, martin107, markie, Schnitzel, alexpott, Sutharsan, mon_franco, YesCT, spearhead93, herom, Désiré: Fixed Language selectors are not showing localized to the page language.
Issue #2361823 by rpayanm, javivf: Remove usage of drupal_strtolower().
Issue #2367835 by rpayanm, andypost: Fixed FormBuilderTest namespace.
Issue #2361747 by rpayanm: Remove truncate_utf8.
Issue #2361837 by rpayanm: Remove drupal_ucfirst.
Issue #2361811 by rpayanm: Remove drupal_strtoupper.
Issue #2367557 by mpdonadio: Fixed Update TestKernel to match class loader changes in Drupal Kernel.