Merge branch '4.3' into 4.4

* 4.3:
  cleanups
  Disable PHPUnit result cache on the CI
  [Security] Cleanup "Digest nonce has expired." translation
  [Translation] Highlight invalid translation status
  Added translations in validator for Serbian Cyrillic
  Added translations in validator for Serbian Latin
  [EventDispatcher] wrong Request class
  [DependencyInjection] improved exception message

Author: nicolas-grekas

Data/Generator/LanguageDataGenerator.php

@@ -27,7 +27,7 @@
 class LanguageDataGenerator extends AbstractDataGenerator
 {
     /**
-     * Source: https://iso639-3.sil.org/code_tables/639/data
+     * Source: https://iso639-3.sil.org/code_tables/639/data.
      */
     private static $preferredAlpha2ToAlpha3Mapping = [
         'ak' => 'aka',

Data/Generator/RegionDataGenerator.php

@@ -28,7 +28,7 @@
 class RegionDataGenerator extends AbstractDataGenerator
 {
     /**
-     * Source https://www.iso.org/obp/ui/#iso:pub:PUB500001:en
+     * Source: https://www.iso.org/obp/ui/#iso:pub:PUB500001:en.
      */
     private static $preferredAlpha2ToAlpha3Mapping = [
         'DE' => 'DEU',