copy includes directory (kubernetes#14020)

content/ja/includes/default-storage-class-prereqs.md

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+You need to either have a dynamic PersistentVolume provisioner with a default
+[StorageClass](/docs/concepts/storage/storage-classes/),
+or [statically provision PersistentVolumes](/docs/user-guide/persistent-volumes/#provisioning)
+yourself to satisfy the [PersistentVolumeClaims](/docs/user-guide/persistent-volumes/#persistentvolumeclaims)
+used here.
+

content/ja/includes/federated-task-tutorial-prereqs.md

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+This guide assumes that you have a running Kubernetes Cluster Federation installation. 
+If not, then head over to the [federation admin guide](/docs/tutorials/federation/set-up-cluster-federation-kubefed/) to learn how to
+bring up a cluster federation (or have your cluster administrator do this for you).
+Other tutorials, such as Kelsey Hightower's [Federated Kubernetes Tutorial](https://github.com/kelseyhightower/kubernetes-cluster-federation),
+might also help you create a Federated Kubernetes cluster.

content/ja/includes/federation-deprecation-warning-note.md

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+Use of `Federation v1` is strongly discouraged. `Federation V1` never achieved GA status and is no longer under active development. Documentation is for historical purposes only.
+
+For more information, see the intended replacement, [Kubernetes Federation v2](https://github.com/kubernetes-sigs/federation-v2).

content/ja/includes/index.md

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+---
+headless: true
+---