did you try ar/index?

the i18n config option doesn't work with the app router

check [the i18n documentation for the app router](https://nextjs.org/docs/app/building-your-application/routing/internationalization)

so you guys removed it from app dirc, is there any other way to just make a internationalized sub-path without any libraries?

like the old built it i18n support in the pages dirc

See here