fix: Nuxt I18n type inference

[BobbieGoede]

• This change seems to resolve i18n breaks Nuxt Auto-Import functionality! nuxt-modules/i18n#2483

Not sure why this change fixes the type inference issue 😅 Also curious why this issue did not show up sooner..

[BobbieGoede]

I wonder why this is not an issue for vuejs/router, the types have the same setup as here, see https://github.com/vuejs/router/blob/b6d12edacbae531c45a4a946d5f20fc82264af52/packages/router/src/globalExtensions.ts#L71.. 🤔

[rchl]

I wonder if there will still be an issue because you are declaring a declare module '@vue/runtime-core' but not referencing @vue/runtime-core first.

[metkm]

Can we also get a release for https://github.com/nuxt-modules/i18n with this fix?