Issue #3001997 by Krzysztof Domański, scott_euser, alexpott: Transliteration a string containing an unknown character (e.g. 0x80) is not valid

(cherry picked from commit f9e7921b)

Revert "Issue #3000630 by scott_euser, Krzysztof Domański, APolitsin, vijaycs85, longwave: Transliteration causes 2 capital letters at the beginning of a word"

This reverts commit 35c3d18a.

Issue #3000630 by scott_euser, Krzysztof Domański, APolitsin, vijaycs85, longwave: Transliteration causes 2 capital letters at the beginning of a word

(cherry picked from commit bb7fb6a3)

Issue #2829185 by vaplas, Jo Fitzgerald, anmolgoyal74, chipway, gaurav.kapoor, mark_fullmer, amit.drupal, cilefen, longwave, xjm, wturrell, anavarre: Fix spelling errors in Drupal core comments

(cherry picked from commit 2dabd1de)

Issue #2887161 by Mohit Malik, joelpittet: Ensure argument order is correct for assertSame() assertions

Issue #2866894 by maxocub: Component tests should not use Drupal\Tests\UnitTestCase but PHPUnit\Framework\TestCase

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 #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

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

Issue #2571845 by drupal.ninja03, hussainweb, anil280988, snehi, jhodgdon, GoZ, stefan.r: Links to wikipedia/php.net should be part of the actual t() string so they can be localized

Issue #731298 by pjonckiere, jhodgdon: Searches for words with diacritics/accents: word not highlighted in results

Issue #2051467 by jhedstrom, dawehner, amateescu, Berdir, herom, Mile23: Expand and convert to phpunit tests for \Drupal\Component\Transliteration

Issue #2347999 by Mile23, daffie, cs_shadow, cosmicdreams: DrupalUnitTestBase is deprecated, replace with KernelTestBase

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).