Merge branch '4.4' into 5.1

* 4.4:
  [ErrorHandler] Return false directly and remove unused variable
  [OptionsResolver] Assert that the error type is valid in deprecations test
  [HttpClient] Allow bearer token with colon
  [Form] Fix custom formats deprecation with HTML5 widgets
  [Translator] Optional Intl dependency
  [Contracts][Translation] Optional Intl dependency
  [ErrorHandler] Escape JSON encoded log context
  update missing translations arabic
  [Yaml] simplify the test
  fix test by letting mock throw the actual expected exception

Author: fabpot

Tests/OptionsResolverTest.php

@@ -524,7 +524,9 @@ public function testDeprecationMessages(\Closure $configureOptions, array $optio
     {
         $count = 0;
         error_clear_last();
-        set_error_handler(function () use (&$count) {
+        set_error_handler(function (int $type) use (&$count) {
+            $this->assertSame(\E_USER_DEPRECATED, $type);
+
             ++$count;
 
             return false;