feat: Support multiple languages on one or more domains while having different domains

[bjerggaard]

🔗 Linked issue

#2418

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This change will support different domains while having more than one language on one or more of the domains.
In order to support the various strategies one must set a domainDefault: true on the default/fallback locale on each domain.

Resolves #2418

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
i18n	Edit on Studio ↗︎	View Live Preview	bbef049

[WooHoo-Wu]

This feature is urgently needed, please release the official version as soon as possible, thank you! ! !

[BobbieGoede]

Thanks for contributing!

This PR looks great, I'm happy to see this doesn't seem to introduce any breaking changes. I'm not seeing anything glaring that needs to be changed, what do you think @kazupon?

The configuration for locales is getting a bit complicated, which isn't necessarily an issue but we could consider changing this for v9, feel free to suggest changes in the roadmap discussion #2814 if you have ideas.

[kazupon]

Sorry, my late reply.
Looks good feature too me

Thanks

[bezoerb]

This kind of introduces breaking changes as we're not able to use Custom route paths with different domains anymore.
Before this it was possible to omit the strategy option and have localized paths without prefix. This is not possible anymore so we need to downgrade to v8.2.0

Is there any chance to also bring back the old behavior by allowing strategy: 'no_prefix' together with differentDomains: true?

I guess this change here introduces the breaking change:
https://github.com/nuxt-modules/i18n/pull/2705/files#diff-692e2f97144046b5098ccb96849867854a2811345bd2ee991c0fc6d2e47f4a38L34

/cc @BobbieGoede @kazupon