add missing license header

Change-Id: If8503566d02b2e2de51acc21f33042b9cc23b059

i18npool/source/localedata/data/vec_IT.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE Locale SYSTEM 'locale.dtd'>
+<!--
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ -->
 <Locale versionDTD="2.0.3" allowUpdateFromCLDR="no" version="1.0">
   <LC_INFO>
     <Language>