hugo/content/en/methods/page/AllTranslations.md

title	description	categories	keywords	action
AllTranslations	Returns all translation of the given page, including the given page.			related returnType signatures methods/page/Translations methods/page/IsTranslated methods/page/TranslationKey page.Pages PAGE.AllTranslations

With this site configuration:

{{< code-toggle file=hugo >}} defaultContentLanguage = 'en'

[languages.en] contentDir = 'content/en' languageCode = 'en-US' languageName = 'English' weight = 1

[languages.de] contentDir = 'content/de' languageCode = 'de-DE' languageName = 'Deutsch' weight = 2

[languages.fr] contentDir = 'content/fr' languageCode = 'fr-FR' languageName = 'Français' weight = 3 {{< /code-toggle >}}

And this content:

content/
├── de/
│   ├── books/
│   │   ├── book-1.md
│   │   └── book-2.md
│   └── _index.md
├── en/
│   ├── books/
│   │   ├── book-1.md
│   │   └── book-2.md
│   └── _index.md
├── fr/
│   ├── books/
│   │   └── book-1.md
│   └── _index.md
└── _index.md

And this template:

{{ with .AllTranslations }}
  <ul>
    {{ range . }}
      {{ $langName := or .Language.LanguageName .Language.Lang }}
      {{ $langCode := or .Language.LanguageCode .Language.Lang }}
      <li><a href="{{ .RelPermalink }}" hreflang="{{ $langCode }}">{{ .LinkTitle }} ({{ $langName }})</a></li>
    {{ end }}
  </ul>
{{ end }}

Hugo will render this list on the "Book 1" page of each site:

<ul>
  <li><a href="/books/book-1/" hreflang="en-US">Book 1 (English)</a></li>
  <li><a href="/de/books/book-1/" hreflang="de-DE">Book 1 (Deutsch)</a></li>
  <li><a href="/fr/books/book-1/" hreflang="fr-FR">Book 1 (Français)</a></li>
</ul>

On the "Book 2" page of the English and German sites, Hugo will render this:

<ul>
  <li><a href="/books/book-1/" hreflang="en-US">Book 1 (English)</a></li>
  <li><a href="/de/books/book-1/" hreflang="de-DE">Book 1 (Deutsch)</a></li>
</ul>