This PR completes the translation of the first half of the Python descriptor guide (howto/descriptor.po) from English to Traditional Chinese (Taiwan).

What was translated

The first half includes:

1.Introduction & Contents Section

• Guide overview explaining the four major sections
• Clear navigation guidance for readers new to descriptors

2.Primer Section (Complete)

• Simple example: Basic descriptor that returns a constant
• Dynamic lookups: Descriptors that run computations
• Managed attributes: Using descriptors to control access to instance data
• Customized names: Leveraging__set_name__ for automatic field naming
• Closing thoughts: Core descriptor concepts and their usage throughout Python

Translation Quality

• ✅Build tested: No syntax errors or warnings
• ✅Terminology consistency: Established standard Chinese translations for key technical terms
• ✅reST formatting preserved: All Sphinx markup and cross-references maintained
• ✅Code examples preserved: Programming examples left in English as per project conventions

Key Technical Terms Established

The translation makes descriptor concepts accessible to Chinese-speaking Python developers, covering all fundamental examples and explanations needed to understand how descriptors work.

Fixes#450.

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