[5.x] Update files_joomla.sys.ini (#40771)

Author: brianteeman

language/en-GB/files_joomla.sys.ini

@@ -6,4 +6,4 @@
 FILES_JOOMLA="Joomla CMS"
 FILES_JOOMLA_ERROR_FILE_FOLDER="Error on deleting file or folder %s"
 FILES_JOOMLA_ERROR_MANIFEST="Error on updating manifest cache: (type, element, folder, client) = (%s, %s, %s, %s)"
-FILES_JOOMLA_XML_DESCRIPTION="Joomla! 4 Content Management System."
+FILES_JOOMLA_XML_DESCRIPTION="Joomla! 5 Content Management System."