merged branch Aitboudad/patch-2 (PR #7787)

This PR was squashed before being merged into the master branch (closes #7787).

Discussion
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[Validator] added Arabic translation for ISSN message

Commits
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4ae9b52 [Validator] added Arabic translation for ISSN message

src/Symfony/Component/Validator/Resources/translations/validators.ar.xlf

@@ -238,6 +238,10 @@
                 <source>This value is neither a valid ISBN-10 nor a valid ISBN-13.</source>
                 <target>هذه القيمة ليست ISBN-10 صالحة ولا ISBN-13 صالحة.</target>
             </trans-unit>
+            <trans-unit id="63">
+                <source>This value is not a valid ISSN.</source>
+                <target>هذه القيمة ليست ISSN صالحة.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>