Merge branch '4.4' into 5.1

* 4.4:
  [DI] Fix Preloader exception when preloading a class with an unknown parent/interface
  [Translation] added missing Albanian translations
  [Form, Security, Validator] Add missing Turkish translations (tr)
  Display php info for extra versions in travis
  [ProxyManager] use "composer/package-versions-deprecated" instead of "ocramius/package-versions"
  38737 add missing dutch translation
  Fix transient tests
  [Validator] Add missing Slovak translations.
  [Form, Security, Validator] Add missing Persian translations (fa_IR)
  [Form] Fix wrong translations for Ukrainian (uk)
  [Validator] Add missing translations for Ukrainian (uk)
  [Security] Add missing translations for Ukrainian (uk)
  [Form] Add missing translations for Ukrainian (uk)
  [Security] Add missing Slovak translations.
  [Form] Added missing Spanish translations.
  Fix transient tests

Author: nicolas-grekas

Tests/Transport/AmqpExtIntegrationTest.php

@@ -161,6 +161,9 @@ public function testItReceivesSignals()
         $signalTime = microtime(true);
         $timedOutTime = time() + 10;
 
+        // wait for worker started and registered the signal handler
+        usleep(100 * 1000); // 100ms
+
         // immediately after the process has started "booted", kill it
         $process->signal(15);