Add complete Chinese (zh_CN) localization for all admonition types

[Copilot]

Overview

This PR adds complete Chinese (Simplified Chinese, zh_CN) localization support for all admonition types in sphinx-proof. Previously, admonition titles were hardcoded in English, and some admonition types were missing Chinese translations.

Problem

When using language = "zh_CN" in Sphinx configuration, admonition titles were displaying in English instead of Chinese:

Solution

This PR completes the Chinese localization by:

1. Adding missing Chinese translations for admonition types that had incomplete support:

   • Corollary → 推论
   • Example → 例
   • Proof → 证明 (new translation file created)

2. Updating the Proof directive to use the translation system by wrapping the title with the _() function

3. Regenerating locale files (.po and .mo) for zh_CN with all translations

4. Updating documentation to reflect complete Chinese support

Result

All admonition titles now display correctly in Chinese when language = "zh_CN" is configured:

Complete Chinese Translation Support

English	Chinese (zh_CN)
Definition	定义
Theorem	定理
Assumption	假设
Proof	证明
Algorithm	算法
Axiom	公理
Conjecture	猜想
Corollary	推论
Criterion	准则
Example	例
Lemma	引理
Observation	观察
Property	性质
Proposition	命题
Remark	注记

Usage

To enable Chinese localization in your Sphinx project, simply add this to your conf.py:

language = "zh_CN"

Testing

• All existing tests pass (15/15)
• Manually verified Chinese translations display correctly in HTML output
• Tested with multiple admonition types (Theorem, Definition, Assumption, Proof, Example, Corollary)

Changes

• sphinx_proof/directive.py - Added translation support to ProofDirective
• sphinx_proof/translations/jsons/Corollary.json - Added Chinese translation
• sphinx_proof/translations/jsons/Example.json - Added Chinese translation
• sphinx_proof/translations/jsons/Proof.json - Created new translation file
• sphinx_proof/translations/locales/zh_CN/LC_MESSAGES/proof.mo - Regenerated binary locale file
• docs/source/internationalization.md - Updated documentation

Fixes #145

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add Chinese localisation for tiles of admonitions.</issue_title>
<issue_description>### Context

Currently admonitions are written automatically in English.

Proposal

We should update the extension to allow for Chinese titles (and other languages).

In this case Theorem should be 定理

English	Chinese
Definition	定义
Theorem	定理
Assumption	假设
Proof	证明

Tasks and updates

• enable localisation support in extension
• add Chinese for all admonition types.
• enable configuration setting for zh-cn</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #152

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