chore: updated Japanese translation

Author: thorsten

phpmyfaq/assets/templates/admin/configuration/plugins.twig

@@ -36,6 +36,12 @@
       </tbody>
     </table>
 
+    <p>
+      <a target="_blank" href="https://phpmyfaq.readthedocs.io/en/main/plugins/">
+        {{ 'msgDocumentation' | translate }}
+      </a>
+    </p>
+
   </div>
 </div>