UI text not translated when creating a multilingual site with only one locale about starlight HOT 3 OPEN

Thank you for the report and the clear reproduction @sschultze!

I can confirm I’m seeing the same thing in your StackBlitz link. I think we never accounted for this situation with the expectation that monolingual sites always used the root as the default locale (as shown in our i18n guide), but this should work.

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Thank you @delucis !

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I did a little debugging and found out that the when returning the UserConfig it's expected to have "root" present but because of the Zod configuration it is not mandatory.

This would be fixed by changing this on user-config.ts:

	/** Configure locales for internationalization (i18n). */
	locales: z
		.object({
			/** Configure a “root” locale to serve a default language from `/`. */
			root: LocaleSchema.required({ lang: true }).required(),
		})

Either way I've also noticed that if we set "root" plus another locale setting the "defaultLocale" has no effect.

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