fix: support like 'enAU' 'en_AU' locales in IntlMessageFormat

[apades]

If locales params like camel case 'enUS', undline 'en_US', it will throw err when i use dynamic values template, i find that intl-messageformat only support kebab-case locale.

Error like this

IntlError: INVALID_MESSAGE: Incorrect locale information provided
    at getFallbackFromErrorAndNotify (webpack-internal:///(rsc)/../../packages/use-intl/dist/development/createFormatter-DbsypjTl.js:170:23)
    at translateBaseFn (webpack-internal:///(rsc)/../../packages/use-intl/dist/development/createFormatter-DbsypjTl.js:236:20)
    at translateFn (webpack-internal:///(rsc)/../../packages/use-intl/dist/development/createFormatter-DbsypjTl.js:258:24)

So i try to fixed it, many repositories have these naming schemes, it very distressed when i using dynamic values template

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[amannn]

Thanks for considering a PR! However, next-intl aligns with the Intl.Locale API which doesn't intend to support these alternative variants.

If your use case is showing these variants on the pathname, you can consider using custom prefixes.

Hope that helps!

[apades]

custom prefixes didn't resolve my problem, but I get your point. Maybe you can alert some Intl.Locale error about some alternative variants, it will decrease some confusion about “It's working, but why I can not use dynamic tempalte”, I have seen this related on reddit and stackoverflow😂

[amannn]

Oh you mean that we could include a warning if an invalid locale is received? That could be a good idea, yes—I made a note about it in #779. Thanks for raising this!