MissingMiddlewareForInternationalization: Your configuration setting
i18n.routing: 'manual'requires you to provide your own i18nmiddlewarefile.
Astro throws an error if the user enables manual routing, but it doesn’t have a middleware file.
Error Reference
© 2021 Fred K. Schott
Licensed under the MIT License.
https://docs.astro.build/en/reference/errors/missing-middleware-for-internationalization/