Fallback locale for dialects

[riccardolardi]

Does next-intl support something similar to https://github.com/i18next/next-i18next?tab=readme-ov-file#fallback-locales ?

My use case is that the default locale should be de-CH (swiss german) and users with locale de should be forwarded / should fall back to de-CH. Same with it-CH (swiss italian) and fr-CH (swiss french) that should also accept their "native" locale

[amannn]

next-intl doesn't support a "fallback locale", but the most appropriate locale should always be used regardless.

I've just added some tests in e6231f9 to verify this—hope this helps!