Added full Spanish translation for lessons 2 and 3.

[KerySeverino]

• This PR adds Spanish translations for Lesson 2 (Exploring and comparing different LLMs) and Lesson 3 (Using Generative AI Responsibly) as part of the Generative AI for Beginners curriculum.

• Spanish is the second most spoken language in the world. As a native Spanish speaker from the Dominican Republic, I hope to make this content more accessible to Spanish-speaking learners, especially those who, like me, are just beginning their journey into AI and Machine learning.

• This contribution is part of my broader mission to promote inclusive, multilingual AI education, and I’m excited to continue helping make open-source educational resources more globally accessible.

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