feat(stage-ui,i18n): added Japanese as language option

[taxi13245]

Description

This PR adds Japanese as a selectable language option in the application's language settings.
While Japanese was already added to the Crowdin project, the language selection option was missing from the app's settings screen. As a result, users were unable to switch the app language to Japanese. This PR resolves that issue.

Additional Context

Running pnpm lint && pnpm typecheck revealed some pre-existing lint errors (such as formatting issues in Cargo.toml and warnings in llm.ts), but these are unrelated to the changes in this PR and have not been addressed here. (It's also possible that these errors are specific to my local environment setup.)

[gemini-code-assist]

Summary of Changes

Hello @taxi13245, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a missing feature where, despite Japanese translations being available via Crowdin, users were unable to select Japanese as their preferred language within the application's settings. By updating the language mapping configuration, this PR ensures that Japanese now appears as a selectable option, allowing users to fully utilize the localized content.

Highlights

• Japanese Language Support: Japanese language codes ('ja' and 'ja-JP') have been added to the 'languageRemap' constant, enabling users to select Japanese as an application language in the settings.

Ignored Files

• Ignored by pattern: packages/i18n/src/** (1)
  • packages/i18n/src/index.ts

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[gemini-code-assist]

Code Review

This pull request correctly adds Japanese as a language option in the settings by updating the languageRemap object. The change is straightforward and functional. The suggestion to remove a redundant mapping to improve code clarity and maintainability has been retained. Overall, this is a good addition to enable Japanese language support.

[gemini-code-assist]

The identity mapping from 'ja' to 'ja' is redundant. The getLanguage function will correctly handle the 'ja' language code even without this entry, so only the 'ja-JP' mapping is necessary. While similar redundancies exist for other languages (e.g., 'en', 'es'), removing this new redundant entry is a good step towards improving code clarity.

  'ja-JP': 'ja'