Clarify lang keyword

Co-authored-by: Joe Mooring <[email protected]>

content/en/content-management/front-matter.md

@@ -187,6 +187,12 @@ environment
 
 Any of the above can be omitted.
 
+{{% note %}}
+When making a site that supports multiple languages, defining a `[[cascade]]` is recommended to be done in [Site Config](../../getting-started/configuration/#cascade) to prevent duplication.
+
+If you instea define a `[[cascade]]` in front matter for multiple languages, an `content/XX/foo/_index.md` file needs to be made on a per-language basis, with `XX` the glob pattern matching the Page's language. In this case, the **lang** keyword is ignored. 
+{{% /note %}}
+
 ### Example
 
 In `content/blog/_index.md`

content/en/getting-started/configuration.md

@@ -190,7 +190,15 @@ See [Configure File Caches](#configure-file-caches)
 
 ### cascade
 
-Pass down default configuration values (front matter) to pages in the content tree. The options in site configuration is the same as in page front matter, see [Front Matter Cascade](/content-management/front-matter#front-matter-cascade).
+Pass down down default configuration values (front matter) to pages in the content tree. 
+The options in site config is the same as in page front matter, see [Front Matter Cascade](/content-management/front-matter#front-matter-cascade). 
+
+{{% note %}}
+For a website in a single language, define the `[[cascade]]` in [Front Matter](/content-management/front-matter#front-matter-cascade).   
+For a multilingual website, define the `[[cascade]]` in [Site Config](../../getting-started/configuration/#cascade).
+
+To remain consistent and prevent unexpected behaviour, do not mix these strategies.
+{{% /note %}}
 
 ### canonifyURLs