Update localization docs: BCP-47 codes and fallback behavior#5202
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Update localization docs: BCP-47 codes and fallback behavior#5202
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- Replace ISO 639-1 language codes with BCP-47 language tags (e.g., fr-FR, ja-JP) - Update all examples (folder names, docs.yml config, file paths) to use BCP-47 format - Add Fallback behavior section explaining that non-localized assets automatically resolve from the default language Co-Authored-By: bot_apk <apk@cognition.ai>
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Requested by: devin |
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| <Step title="Add a translations folder"> | ||
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| Create a `translations` folder inside your `fern` directory, with a subfolder for each language using its [ISO 639-1 code](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) (e.g., `fr`, `ja`). Mirror your `pages/` structure inside each language folder. | ||
| Create a `translations` folder inside your `fern` directory, with a subfolder for each language using its [BCP-47 language tag](https://en.wikipedia.org/wiki/IETF_language_tag) (e.g., `fr-FR`, `ja-JP`). Mirror your `pages/` structure inside each language folder. |
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📝 [vale] reported by reviewdog 🐶
[FernStyles.Acronyms] 'BCP' has no definition.
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| ## Fallback behavior | ||
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| You only need to provide translated versions of the files you want to localize. For any file that does not have a translated version in a language folder — such as images, diagrams, or pages you have not yet translated — Fern automatically falls back to the default-language version. |
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🚫 [vale] reported by reviewdog 🐶
[Microsoft.Contractions] Use 'doesn't' instead of 'does not'.
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| ## Fallback behavior | ||
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| You only need to provide translated versions of the files you want to localize. For any file that does not have a translated version in a language folder — such as images, diagrams, or pages you have not yet translated — Fern automatically falls back to the default-language version. |
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🚫 [vale] reported by reviewdog 🐶
[Microsoft.Contractions] Use 'haven't' instead of 'have not'.
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| You only need to provide translated versions of the files you want to localize. For any file that does not have a translated version in a language folder — such as images, diagrams, or pages you have not yet translated — Fern automatically falls back to the default-language version. | ||
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| This means you do not need to copy non-localized assets (like `.png` or `.svg` files) into each language folder. Fern resolves them from the default-language source, keeping your translation folders lean and avoiding duplicate file maintenance. |
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🚫 [vale] reported by reviewdog 🐶
[Microsoft.Contractions] Use 'don't' instead of 'do not'.
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🌿 Preview your docs: https://fern-preview-devin-1777392203-update-localization-docs.docs.buildwithfern.com/learn Here are the markdown pages you've updated: |
devalog
approved these changes
Apr 28, 2026
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Summary
Updates the localization overview page with two changes:
BCP-47 language tags — Replaces all ISO 639-1 code references (
fr,ja,en) with BCP-47 language tags (fr-FR,ja-JP,en-US). This includes the explanatory text, folder name examples in the file tree,docs.ymlconfig snippet, and translated file path examples.Fallback behavior section — Adds a new section documenting that non-localized files (images, diagrams, untranslated pages) automatically fall back to the default-language version. Users do not need to copy assets into each language folder.
Review & Testing Checklist for Human
fr-FR,ja-JP,en-US) match the codes supported by the Fern CLINotes
Requested by: Fern Support