User folder is created by CreateUserTemplatePagesValve when the user first logs.
And folder.metadata is created by CreateUserTemplatePagesValve also.
But folder.metadata don't has right title&short-title value.
as follow step.
1. CreateUserTemplatePagesValve add pipeline then WAS reboot.
2. User Login the portal.
3. User's new folder and pages created (deep copy folder from the _user/template/).
4. Open the user/folder.metadata file.
5. folder.metadata title& short-title tag value is "template".
I think that folder.metadata title&short-title has the userID.