i18n(es): update Spanish UI translations

[aaronperezaguilera]

Description

Updated Spanish UI translations.

[changeset-bot]

🦋 Changeset detected

Latest commit: 63fea3c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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[delucis]

Thank you for adding these!