Force URL Slug

Is there any chance to force always language URL slug?

For example, we had three languages, English is not default and we need to always show domain/LANGUAGE/
Now it's default for english is no URL Slug.

Did we need to change something in core? We prefer to do not touch core code.

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Largo replied on at Permalink Reply
No one knows? I found a way to change it but as I said previously, I don't want to change core - it affects on update CMS.