Merge release 1.14 into 1.15. (#16439)

1. Confirm the document content is similar as en version.
2. Merge the zh release-1.14 version into 1.15 version
3. add the 1.14 all sample into 1.15 for template work. The build looks fine.

- docs
  - concepts
    - architecture

content/zh/examples/pods/security/security-context.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: security-context-demo
+spec:
+  securityContext:
+    runAsUser: 1000
+    fsGroup: 2000
+  volumes:
+  - name: sec-ctx-vol
+    emptyDir: {}
+  containers:
+  - name: sec-ctx-demo
+    image: gcr.io/google-samples/node-hello:1.0
+    volumeMounts:
+    - name: sec-ctx-vol
+      mountPath: /data/demo
+    securityContext:
+      allowPrivilegeEscalation: false