Add guidelines for working with localized content (#11415)

Clarify about where to look for specific l10n tasks

More accurate link pointer

Update link for upstream contributions

content/en/docs/contribute/intermediate.md

@@ -806,6 +806,18 @@ content. See [Localization](/docs/contribute/localization/) and ask on the
 [kubernetes-sig-docs mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-docs)
 or in `#sig-docs` on Slack if you are interested in helping out.
 
+### Working with localized content
+
+Follow these guidelines for working with localized content:
+
+- Limit PRs to a single language. 
+
+   Each language has its own reviewers and approvers.
+
+- Reviewers, verify that PRs contain changes to only one language.
+
+   If a PR contains changes to source in more than one language, ask the PR contributor to open separate PRs for each language.
+
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content/en/docs/contribute/localization.md

@@ -203,7 +203,7 @@ For more information about working from forks or directly from the repository, s
 
 ### Upstream contributions
 
-SIG Docs welcomes upstream contributions and corrections to the English source! Open a [pull request](https://kubernetes.io/docs/contribute/start/#improve-existing-content) (from a fork) with any updates.
+SIG Docs welcomes [upstream contributions and corrections](/docs/contribute/intermediate#localize-content) to the English source. 
 
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content/en/docs/contribute/start.md

@@ -24,12 +24,7 @@ code repositories, refer to
 
 ## The basics about our docs
 
-The Kubernetes documentation is written in Markdown and processed and deployed
-using Hugo. The source is in Github at
-[https://github.com/kubernetes/website](https://github.com/kubernetes/website).
-Most of the documentation source is stored in `/content/en/docs/`. Some of the
-reference documentation is automatically generated from scripts in the
-`update-imported-docs/` directory.
+The Kubernetes documentation is written in Markdown and processed and deployed using Hugo. The source is in Github at [https://github.com/kubernetes/website](https://github.com/kubernetes/website). Most of the documentation source is stored in `/content/en/docs/`. Some of the reference documentation is automatically generated from scripts in the `update-imported-docs/` directory.
 
 You can file issues, edit content, and review changes from others, all from the
 Github website. You can also use Github's embedded history and search tools.
@@ -70,6 +65,14 @@ We make use of the standard Hugo shortcodes, as well as a few that are custom to
 the Kubernetes documentation. See [Custom Hugo shortcodes](/docs/contribute/style/hugo-shortcodes/) for
 information about how to use them.
 
+### Multiple languages 
+
+Documentation source is available in multiple languages in `/content/`. Each language has its own folder with a two-letter code determined by the [ISO 639-1 standard](https://www.loc.gov/standards/iso639-2/php/code_list.php). For example, English documentation source is stored in `/content/en/docs/`. 
+
+For more information about contributing to documentation in multiple languages, see ["Localize content"](/docs/contribute/intermediate#localize-content) in the intermediate contributing guide.
+
+If you're interested in starting a new localization, see ["Localization"](/docs/contribute/localization/).
+
 ## File actionable issues
 
 Anyone with a Github account can file an issue (bug report) against the