fix(translations): fall back to base language tag for Accept-Language matching#15076
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PatrikKozak merged 5 commits intopayloadcms:mainfrom Apr 9, 2026
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matching \### Why? Some browsers send only regional tags like `ja-JP` in the `Accept-Language` header. When no exact match exists, the current behavior can fail to detect a supported base language, leading to missed localization. \### What? Allow language detection to fall back from a regional tag (e.g., `ja-JP`) to its base tag (`ja`) when the exact match is not supported. \### How? While parsing `Accept-Language`, check for an exact match in `acceptedLanguages`, and if none is found, split on `-` and try the base language tag before giving up.
PatrikKozak
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Apr 9, 2026
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🚀 This is included in version v3.83.0 |
milamer
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Apr 20, 2026
… matching (payloadcms#15076) ### Why? Some browsers send only regional tags like `ja-JP` in the `Accept-Language` header. When no exact match exists, the current behavior can fail to detect a supported base language, leading to missed localization. ### What? Allow language detection to fall back from a regional tag (e.g., `ja-JP`) to its base tag (`ja`) when the exact match is not supported. ### How? While parsing `Accept-Language`, check for an exact match in `acceptedLanguages`, and if none is found, split on `-` and try the base language tag before giving up. --------- Co-authored-by: Patrik Kozak <35232443+PatrikKozak@users.noreply.github.com>
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Why?
Some browsers send only regional tags like
ja-JPin theAccept-Languageheader. When no exact match exists, the current behavior can fail to detect a supported base language, leading to missed localization.What?
Allow language detection to fall back from a regional tag (e.g.,
ja-JP) to its base tag (ja) when the exact match is not supported.How?
While parsing
Accept-Language, check for an exact match inacceptedLanguages, and if none is found, split on-and try the base language tag before giving up.