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* zh_trans: kubeadm-upgrade-1-12.md * update file * Update _index.md * Delete _index.md * Update kubeadm-upgrade-1-12.md * zh_trans: docs/reference/setup-tools/kubeadm/generated/kubeadm_config.md * Update kubeadm_config.md * zh_trans: fix Preview * zh_trans: fix Preview