I find this article http://blog.dennus.net/2011/05/17/modify-and-repackage-sharepoint-stp-files/
i have follow the process to edit the STP file and i change in the manifest.xml the line
<Language>1032</Language>
With the line
<Language>1033</Language>
i package the STP and i uploaded on Sharepoint online . Now i have create a list
based on the template that i have just uploaded