When you create content that has translation inside parent content that has same language translation too, only last part of displayed URL will be based on translated content name.

Steps to reproduce:
1. Define more than one language for admin siteaccess. For this example I used UK English and Polish.

       admin_group:
            languages: [eng-GB, pol-PL]

2. Create folder named "Articles" in English and "Artykuły" for Polish.
3. Inside "Articles" folder create article named "Testing Article" for English and "Testowy artykuł" for Polish. Publish it.
4. Go to "URL" tab.

Result
You will see (in System URL section) that only last part of URL uses translated content. Same goes for URL Aliases (please see attached screenshots).