Bug report: Region-specific browser language preferences are being ignored

[wackerow]

Describe the bug

The next/router plugin automatically checks the preferred language/region for the users browser when going to ethereum.org, and forwards the user to the matching locale if available.

In cases where this browser preference contains region-specificity (ie. pt-BR for Brazilian Portuguese) users should be redirected to this region (if available, ie. /pt-br), but is instead being directed to the root language /pt instead.

To reproduce

1. Set your browser language to Portuguese Brazilian (pt-br), or Chinese Traditional (zh-tw) (use a new browser profile if needed, or clear cache / use a private browser window)
2. Go to https://ethereum.org (without any language in the path)
3. Notice the page forwards to https://ethereum.org/pt (or https://ethereum.org/zh if Chinese Traditional was used)

Expected behavior

If browser preference contains a region that is in our list of supported locales, the user should be forwarded to the region-specific path (ie. Brazilian Portuguese should direct ethereum.org to ethereum.org/pr-bt, not ethereum.org/pt).

Screenshots

No response

Desktop (please complete the following information)

• macOS Sonom 14.2.1
• Brave 1.62.153

Smartphone (please complete the following information)

No response

Additional context

This may be related to the next-i18next.config.js settings, potentially a side-effect of the cleanCode, load or lowerCaseLng properties but haven't investigated much further yet.

Would you like to work on this issue?

• Yes
• No

[HiroyukiNaito]

@wackerow
I could reproduce the bug on WIndows

• Microsoft Windows 11 Home v10.0.22621 N/A build 22621
• Brave Release Notes v1.62.153 (Jan 25, 2024)

I looks like only Brave browser environment.

[HiroyukiNaito]

I would pick this issue.

[HiroyukiNaito]

It could suppress the issue by the JSON order pt-br -> pt -> zh-tw -> zh (Prioritizing hyphen language order)

[github-actions]

This issue is stale because it has been open 45 days with no activity.