fix(i18n): correct typo in Spanish translation for 'Preparation'

[JuanJesusAlejoSillero]

Testing done

No tests were performed as this is a minor change fixing a typo in the translation.

Proposed changelog entries

• Fix typo in the Spanish translation of 'Preparation'

Proposed upgrade guidelines

N/A

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3. There is automated testing or an explanation as to why this change has no tests.
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7. For dependency updates, there are links to external changelogs and, if possible, full differentials.
8. For new APIs and extension points, there is a link to at least one consumer.

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Nobody in particular (?).

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4. Proper changelog labels are set so that the changelog can be generated automatically.
5. If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set and there is a Proposed upgrade guidelines section in the pull request title (see example).
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[NotMyFault]

/label ready-for-merge

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