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

Resources/translations/validators.ar.xlf

@@ -382,6 +382,10 @@
                 <source>Each element of this collection should satisfy its own set of constraints.</source>
                 <target>يجب أن يفي كل عنصر من عناصر هذه المجموعة بمجموعة القيود الخاصة به.</target>
             </trans-unit>
+            <trans-unit id="99">
+                <source>This value is not a valid International Securities Identification Number (ISIN).</source>
+                <target> صالح (ISIN) هذه القيمة ليست رقم تعريف الأوراق المالية الدولي.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>