i18n URLs do not redirect on wrong language slug

[stefanw]

Consider the following URLs:

• /de/kontakt/ main language contact page
• /en/contact/ English language contact page

However, if somehow the prefix gets changed, the following happens:

• /en/kontakt/ serves the English contact page, but with a German URL
• /de/contact/ serves the German contact page, but with an English URL

I believe this to be a bug. I think there should be a check if the current path (after the language prefix) matches the resolved page and if not, redirect to the page using the correct language path/slug. This should happen in order to have canonical URLs for content.

I will try to provide a PR with a test, if you consider a redirect in this case to be a solution.

[yakky]

Duplicate of #3548

[FinalAngel]

Closed as duplicate