Merge branch '5.4' into 6.0

* 5.4:
  Added italian missing translation
  [Security] Fix `TraceableAuthenticator::createToken()` argument type
  Fix persian (fa) translation
  [Notifier][RocketChat] Fix undefined index for message id
  Add missing translation for Estonian
  Add validator missing french translation
  Add missing translation
  [Security][Validator] Add missing translations for Gallician (gl)
  Update validators.ar.xlf
  [Notifier] Fix 'Undefined array key' error in FirebaseTransport
  bug #43038 [Validator] Fixes URL validation for single-char subdomains.

Author: derrabus

Constraints/UrlValidator.php

@@ -25,7 +25,7 @@ class UrlValidator extends ConstraintValidator
             (%s)://                                 # protocol
             (((?:[\_\.\pL\pN-]|%%[0-9A-Fa-f]{2})+:)?((?:[\_\.\pL\pN-]|%%[0-9A-Fa-f]{2})+)@)?  # basic auth
             (
-                ([\pL\pN\pS]+\.?[\pL\pN\pS\-\_]+)+(\.?([\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
+                ([\pL\pN\pS\-\_]+\.)*(([\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
                     |                                                 # or
                 \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}                    # an IP address
                     |                                                 # or

Resources/translations/validators.ar.xlf

@@ -390,6 +390,10 @@
                 <source>This value should be a valid expression.</source>
                 <target>يجب أن تكون هذه القيمة تعبيرًا صالحًا.</target>
             </trans-unit>
+            <trans-unit id="101">
+                <source>This value is not a valid CSS color.</source>
+                <target>هذه القيمة ليست لون CSS صالحًا.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>

Resources/translations/validators.et.xlf

@@ -390,6 +390,10 @@
                 <source>This value should be a valid expression.</source>
                 <target>See väärtus pole korrektne avaldis.</target>
             </trans-unit>
+            <trans-unit id="101">
+                <source>This value is not a valid CSS color.</source>
+                <target>See väärtus pole korrektne CSS-i värv.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>