Translate `reference/expressions.po`

This needs to reach 100% translated.

The rendered version of this file will be available at https://docs.python.org/es/3.14/reference/expressions.html once translated.
Meanwhile, the English version is shown.

Current stats for reference/expressions.po:

• Fuzzy: 12
• Percent translated: 98.0%
• Entries: 539 / 550
• Untranslated: 11

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Remember to follow the steps in our Contributing Guide.

閱讀 Contributing Guide，然後開啟 reference/expressions.po，翻譯 11 個尚未翻譯的項目，同時解決 12 個標記為 fuzzy 的項目。當檔案達到 100% 翻譯完成，且 docs.python.org/es/3.14/reference/expressions.html 上呈現的西班牙語頁面反映出完整翻譯時，工作即告完成。