Upgrade atsphinx-mini18n to latest version (0.5.1)

[Copilot]

Overview

Upgrades atsphinx-mini18n from 0.4.1 to 0.5.1, bringing nested style output support and bug fixes. Enables the new "Nested style" output feature.

Details

• Updated atsphinx-mini18n==0.4.1 → atsphinx-mini18n==0.5.1 in pyproject.toml
• Added mini18n_build_style = "nested" to conf.py to enable nested style output (default language at root, other languages in subdirectories)
• v0.5.0: Adds nested style output, requires Python 3.10+ and Sphinx 8.0+
• v0.5.1: Removes debug print statement
• Compatible with current setup: CI uses Python 3.12, Sphinx 8.2.1
• Note: docs dependencies now require Python 3.10+ (core tutorial still works on 3.9+)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade atsphinx-mini18n to latest version (0.5.1)</issue_title>
<issue_description>## Summary
The project currently uses atsphinx-mini18n==0.4.1. The latest version is 0.5.1 (released December 4, 2025), which includes significant new features and improvements.

New Features in 0.5.x

Version 0.5.0 (November 17, 2025)

• Major Feature: Support for "Nested style" output (replaces the previous "Flat style" approach)
• Breaking Changes:
  • Requires Python 3.10+ (drops support for Python 3.8 and 3.9)
  • Requires Sphinx 8.0 and later
• Development Infrastructure:
  • Switched from mise to aqua
  • Replaced mypy with ty
  • Updated CI/CD workflows to latest actions
  • Translation generation now references environment variables for translator identification

Version 0.5.1 (December 4, 2025)

• Fix: Removed unused print statement (debugging code cleanup)

Action Required

1. Verify compatibility with current Python version (must be 3.10+)
2. Verify compatibility with Sphinx 8.0+ (current version in pyproject.toml: 8.2.1)
3. Update atsphinx-mini18n==0.4.1 to atsphinx-mini18n==0.5.1 in pyproject.toml
4. Test the documentation build with the new nested style output
5. Review any configuration changes needed for the nested style output format

References

• Repository: https://github.com/atsphinx/mini18n
• Changelog: https://github.com/atsphinx/mini18n/blob/v0.5.1/CHANGES.rst
• Latest Release: https://github.com/atsphinx/mini18n/releases/tag/v0.5.1</issue_description>

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

• Fixes Upgrade atsphinx-mini18n to latest version (0.5.1) #599

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[tkoyama010]

@copilot Please use "Nested style" output of atsphinx-mini18n

[Copilot]

@copilot Please use "Nested style" output of atsphinx-mini18n

Added mini18n_build_style = "nested" to conf.py to enable nested style output. With this configuration, the default language (English) content will be placed at the root level while other languages (Japanese) will be in subdirectories. (8078252)

[github-actions]

🚀 Deployed on https://6933b14086dfbe854ee6a852--courageous-croissant-8a5b98.netlify.app

[tkoyama010]

LGTM

[Copilot]

Pull request overview

This PR upgrades the atsphinx-mini18n package from version 0.4.1 to 0.5.1 and enables the new nested style output feature for multi-language documentation.

• Updated dependency to atsphinx-mini18n==0.5.1 with support for nested-style output (default language at root, other languages in subdirectories)
• Configured the nested build style in Sphinx configuration
• Maintains compatibility with the current Python 3.12 CI environment and Sphinx 8.2.1

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updates atsphinx-mini18n dependency from 0.4.1 to 0.5.1 in the docs optional dependencies
doc/source/conf.py	Adds mini18n_build_style = "nested" configuration to enable the new nested-style multi-language output format

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