Merge branch '3.4' into 4.3

* 3.4:
  Fix typo
  Fix unitialized variable in DeprecationErrorHandler
  fix Danish translations
  Added the missing translations for the Slovak 'sk' locale.
  Fix negative DateInterval

Author: nicolas-grekas

DeprecationErrorHandler.php

@@ -76,7 +76,6 @@ public static function register($mode = 0)
         }
 
         self::$utilPrefix = class_exists('PHPUnit_Util_ErrorHandler') ? 'PHPUnit_Util_' : 'PHPUnit\Util\\';
-        self::$isAtLeastPhpUnit83 = method_exists('PHPUnit\Util\ErrorHandler', '__invoke');
 
         $handler = new self();
         $oldErrorHandler = set_error_handler([$handler, 'handleError']);
@@ -318,6 +317,9 @@ private function displayDeprecations($groups, $configuration)
 
     private static function getPhpUnitErrorHandler()
     {
+        if (!isset(self::$isAtLeastPhpUnit83)) {
+            self::$isAtLeastPhpUnit83 = class_exists(ErrorHandler::class) && method_exists(ErrorHandler::class, '__invoke');
+        }
         if (!self::$isAtLeastPhpUnit83) {
             return (class_exists('PHPUnit_Util_ErrorHandler', false) ? 'PHPUnit_Util_' : 'PHPUnit\Util\\').'ErrorHandler::handleError';
         }

bin/simple-phpunit.php

@@ -10,7 +10,7 @@
  */
 
 // Please update when phpunit needs to be reinstalled with fresh deps:
-// Cache-Id-Version: 2019-07-04 18:00 UTC
+// Cache-Id: 2019-08-09 13:00 UTC
 
 error_reporting(-1);