[FEATURE]: Improve Spanish README translation naturalness and consistency

[necropheus]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Refine several translations to sound more natural in Spanish technical writing. This includes replacing some overly literal translations (eg. "build"), making section titles and wording more idiomatic for software documentation, and fixing inconsistencies in verb forms/tenses across the README.

Also tweak a few phrases that feel unnatural or too directly translated from English.

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• Feature request titles must start with [FEATURE]: (e.g. [FEATURE]: Improve Spanish README translation naturalness and consistency)

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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[github-actions]

Thanks for updating the issue! It now follows our contributing guidelines. We appreciate you taking the time to fix it.