Translate content: expandable Python example indentation fix

[mintlify]

Indents the Book dataclass fields in the expandable Python example on the Spanish, French and Chinese code block pages.
The fields sat at the same level as the class line, so the example raised an IndentationError in every locale.
Based on docs: fix dataclass indentation in expandable Python example, which made the same whitespace-only fix on the English page.

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Note

Low Risk
Documentation-only whitespace changes in localized MDX; no runtime or application logic affected.

Overview
Fixes invalid Python in the expandable code sample on the Spanish (es/create/code.mdx), French (fr/create/code.mdx), and Chinese (zh/create/code.mdx) code-formatting docs by indenting the Book dataclass fields under class Book:.

Previously those attributes were aligned with the class line, which would raise an IndentationError if copied or run. The change mirrors the whitespace-only fix already applied on the English create/code.mdx page.

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