"The youth of today does not sleep in the morning."
Translation:A juventude de hoje não dorme de manhã.
the youth of today DONOT sleep in the morning THIS IS CORRECT ENGLISH
Actually, you're right and you shouldn't have been downvoted. The youth of today = They --> They do not sleep in the morning.
This sentence is awkward in English: "youth" is being used here as a collective noun, and although there's no concrete rule about collective nouns being singular or plural, in this case it would usually take the plural form. A more correct way of saying it would be "The youth of today DO not sleep in the morning".