fix: videoDetails.age_restricted is always false in other languages

[skick1234]

In other languages, notice url is not the value of notice_url property.

In ar:

{
  'إشعار': 'هذا الفيديو محظور على فئات عمرية معيّنة (وفقًا لإرشادات المنتدى)',
  'إشعار_url': 'http://www.youtube.com/t/community_guidelines'
}

In en-US:

{
  notice: 'Age-restricted video (based on Community Guidelines)',
  notice_url: 'http://www.youtube.com/t/community_guidelines'
}

In vi-VN:

{
  'thông báo': 'Video bị giới hạn độ tuổi người xem (dựa trên Nguyên tắc cộng đồng)',
  'thông báo_url': 'http://www.youtube.com/t/community_guidelines'
}

I can check only keys have _url suffix but it is longer and YouTube may localize it like other keys in the future.

[TimeForANinja]

can you add test cases?

[skick1234]

I will do it tomorrow :>

[skick1234]

Rebased and added a test case. Forgot to do that .-.

[github-actions]

🎉 This PR is included in version 4.11.0 🎉

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