By 'move' @hanccocka means either VMotion, cold migrate, or move (move/paste) to a different datastore if they will be on a different datastore.
If your templates aer no longer visible in vCenter, you may also need to re-add them to inventory (browse the datastore your templates are located, rt-click on vmxt file, then add to inventory). Once your templates are re-added, you will need to convert them to a VM then upgrade your virtual hardware (rt-click on VM > upgrade virtual hardware), and also power on the VM to upgrade VMware Tools. Once those upgrades are done you can reconvert the VMs back to templates.
If your templates aer no longer visible in vCenter, you may also need to re-add them to inventory (browse the datastore your templates are located, rt-click on vmxt file, then add to inventory). Once your templates are re-added, you will need to convert them to a VM then upgrade your virtual hardware (rt-click on VM > upgrade virtual hardware), and also power on the VM to upgrade VMware Tools. Once those upgrades are done you can reconvert the VMs back to templates.
Regards,
~coolsport00