Steps to reproduce

• create an article in english
• add a german translation
• publish the new version in german
• go to translation tab and try to delete german

Result

User is redirected to /admin/contenttypegroup//contenttype/"
404 page is displayed and a notification message is displayed:
No route found for "GET /admin/contenttypegroup//contenttype/"

Expected result

Translation should be removed and the user should be redirected to the translation tab