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Translations

Returns all translations of the given page, excluding the current language, sorted by language weight then language name.
Syntax
PAGE.Translations
Returns
page.Pages

With this project configuration:

defaultContentLanguage: en
languages:
  de:
    contentDir: content/de
    label: Deutsch
    locale: de-DE
    weight: 2
  en:
    contentDir: content/en
    label: English
    locale: en-US
    weight: 1
  fr:
    contentDir: content/fr
    label: Français
    locale: fr-FR
    weight: 3
defaultContentLanguage = 'en'
[languages]
  [languages.de]
    contentDir = 'content/de'
    label = 'Deutsch'
    locale = 'de-DE'
    weight = 2
  [languages.en]
    contentDir = 'content/en'
    label = 'English'
    locale = 'en-US'
    weight = 1
  [languages.fr]
    contentDir = 'content/fr'
    label = 'Français'
    locale = 'fr-FR'
    weight = 3
{
   "defaultContentLanguage": "en",
   "languages": {
      "de": {
         "contentDir": "content/de",
         "label": "Deutsch",
         "locale": "de-DE",
         "weight": 2
      },
      "en": {
         "contentDir": "content/en",
         "label": "English",
         "locale": "en-US",
         "weight": 1
      },
      "fr": {
         "contentDir": "content/fr",
         "label": "Français",
         "locale": "fr-FR",
         "weight": 3
      }
   }
}

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 .Translations }}
  <ul>
    {{ range . }}
      <li>
        <a href="{{ .RelPermalink }}" hreflang="{{ .Language.Locale }}">{{ .LinkTitle }} ({{ or .Language.Label .Language.Name }})</a>
      </li>
    {{ end }}
  </ul>
{{ end }}

Hugo renders this list on the book-1 page of the English site:

<ul>
  <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>

Hugo renders this list on the book-2 page of the English site:

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