Template kind friendly names added through the plugin template labels interface can be lost when TemplateKind is reloaded, as it's stored in a class variable.

1. Call template_labels from a plugin registration (e.g. foreman_bootdisk master branch)
2. View the templates list, check it's showing the friendly name
3. Edit TemplateKind, to reload the class
4. Refresh the template list, the friendly name will disappear