Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

docs/content/en/methods/site/LanguagePrefix.md

@@ -0,0 +1,53 @@
+---
+title: LanguagePrefix
+description: Returns the URL language prefix, if any, for the given site.
+categories: []
+keywords: []
+action:
+  related:
+    - functions/urls/AbsLangURL
+    - functions/urls/RelLangURL
+  returnType: string
+  signatures: [SITE.LanguagePrefix]
+---
+
+Consider this site configuration:
+
+{{< code-toggle file=hugo >}}
+defaultContentLanguage = 'de'
+defaultContentLanguageInSubdir = false
+
+[languages.de]
+languageCode = 'de-DE'
+languageDirection = 'ltr'
+languageName = 'Deutsch'
+title = 'Projekt Dokumentation'
+weight = 1
+
+[languages.en]
+languageCode = 'en-US'
+languageDirection = 'ltr'
+languageName = 'English'
+title = 'Project Documentation'
+weight = 2
+{{< /code-toggle >}}
+
+When visiting the German language site:
+
+```go-html-template
+{{ .Site.LanguagePrefix }} → ""
+```
+
+When visiting the English language site:
+
+```go-html-template
+{{ .Site.LanguagePrefix }} → /en
+```
+
+If you change `defaultContentLanguageInSubdir` to `true`, when visiting the German language site:
+
+```go-html-template
+{{ .Site.LanguagePrefix }} → /de
+```
+
+You may use the `LanguagePrefix` method with both monolingual and multilingual sites.