message: build(docs-infra): ensure the correct files are in the i18n example
  The Stackblitz and zip-file include `doc-files` unnecssarily and are missing
  the locale files. This commit updates the `stackblitz.json` to fix this.
  PR Close
diff: "files":[
  "!**/*.d.ts",
  "!**/*.js",
  - "!**/*.[0-9].*"
  + "!**/*.[0-9].*",
  + "!doc-files/**/*",
  + "**/*.xlf"
  ],
  "file": "src/app/app.component.ts",
  "tags": ["Angular", "i18n", "internationalization"]
  