feat(i18n): add translations for Khmer (km-KH)

[nidexingg]

🔗 Linked issue

N/A

🧭 Context

Currently, npmx.dev supports several languages but lacks Khmer (Cambodian) localization. This limits accessibility for Khmer-speaking users. Adding Khmer language support improves inclusivity and aligns with the project’s internationalization goals.

📚 Description

This PR adds full support for the Khmer language (km) across the npmx.dev platform.

Changes include:

• Added km.json to the localization folder containing Khmer translations for all existing UI keys.
• Updated i18n configuration to include Khmer in the list of supported locales.
• Modified the language switcher component to display “Khmer (ខ្មែរ)” as a selectable option.
• Verified rendering and layout compatibility for Khmer text.

Why this change is required:

• Expands accessibility for users in Cambodia and Khmer-speaking communities.
• Strengthens project localization coverage.
• Encourages more open-source contributions from Southeast Asia.

Testing and validation:

• Ran existing localization tests to confirm there are no regressions.
• Added new unit tests to verify Khmer translation loading and proper rendering.
• Manual review by Khmer-speaking contributors to confirm translation accuracy.

Tradeoffs and follow-ups:

• Some technical terminology still needs community review for consistency.
• Future PR may be needed to extend documentation and contributor guidelines for new language additions.

Additional notes:
AI tools were used to assist with translation verification, but all content has been manually reviewed and refined to ensure correctness and natural phrasing. The code, translation files, and documentation reflect my own understanding and intent for this contribution.

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[coderabbitai]

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Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (1)

• i18n/locales/km-KH.json

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Reviewing files that changed from the base of the PR and between 6c604d2 and 51d8562.

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• i18n/locales/km-KH.json

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📝 Walkthrough

Walkthrough

Adds Khmer locale support by registering km-KH in config/i18n.ts with its translation file and name (ភាសាខ្មែរ), causing currentLocales and the derived datetimeFormats, numberFormats, and pluralRules maps to include km-KH.

Changes

Cohort / File(s)	Summary
i18n config config/i18n.ts	Adds { code: 'km-KH', file: 'km-KH.json', name: 'ភាសាខ្មែរ' } to the locales array, which extends currentLocales and the derived format/plural maps.
Locale asset locales/km-KH.json	Adds the Khmer translation JSON referenced by the new km-KH locale entry. (If present in the PR)

Possibly related PRs

• feat(i18n): add marathi support #800: Also modifies config/i18n.ts to add a locale entry (mr-IN), same file and pattern.
• feat(i18n): add bangla support #1280: Adds a locale entry (bn-IN) to config/i18n.ts, same structural change.
• feat(i18n): add bulgarian language #1472: Adds a locale entry to config/i18n.ts and updates locale-related maps similarly.

Suggested reviewers

• danielroe

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is comprehensive and directly related to the changeset, detailing context, specific changes made, testing performed, and rationale.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: adding Khmer locale support (km-KH) to the i18n configuration, which aligns with the primary objective of extending localization support.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[ghostdevv]

👋 Hey @nidexingg, thanks for adding Khmer support!

In lieu of a CodeRabbit review (it skipped this one), I had an LLM review the translation content. Here are its findings — have a look and let me know what makes sense and what doesn't.

---

1. Locale display name — likely incorrect

File: config/i18n.ts:219

The display name is currently ខេមរភាសា. The standard Khmer endonym used by the Cambodian government, Unicode CLDR, and Wikipedia is ភាសាខ្មែរ (Phéasa Khmêr). The current form uses a Pali/Sanskrit-derived root in a non-standard word order that isn't commonly seen in modern usage. Could you double-check this?

2. Thai script mixed into Khmer text

File: i18n/locales/km-KH.json:323

The common.scroll_to_top value is "រំកិលទៅលើកสุต" — the last few characters (สุต) are Thai script (U+0E2A, U+0E38, U+0E15), not Khmer. Thai and Khmer look similar but they're entirely different Unicode blocks. This looks like a copy-paste or machine translation artefact. Something like "រំកិលទៅខាងលើ" would be the expected Khmer.

3. Untranslated user-facing strings

Roughly 30 strings that other established locales (e.g. ja-JP) translate have been left in English here. A few examples:

Key	Current value	Translated in ja-JP?
provenance_section.transparency_log_entry	Transparency log entry	✅ 透明性ログエントリ
trends.average_window	Average window	✅ 平均ウィンドウ
trends.smoothing	Smoothing	✅ スムージング
install_scripts.title	Install Scripts	✅ インストールスクリプト
dependencies.title	Dependency ({count}) | Dependencies ({count})	✅ 依存関係（{count}）
dependencies.list_label	Package dependencies	✅ パッケージの依存関係
access.title	Team Access	—
chart_view_combined	Combined view	—

(Note: strings like settings.title, blog.heading, nav.settings, colour names, and brand.heading are intentionally kept in lowercase English across all locales — those are fine.)

4. Minor: English plural suffixes (not blocking)

Khmer doesn't have grammatical plurals, so the pipe-separated forms like "{count} skill អាចប្រើបាន | {count} skills អាចប្រើបាន" don't strictly need to differ between the singular and plural side. There are about 38 instances of this. It's cosmetic and won't break anything, so not blocking — just worth being aware of for future tidying.

---

Items 1–3 should ideally be addressed before merging. Happy to help if anything's unclear!

[ghostdevv]

see above ^

[nidexingg]

Hey @ghostdevv Thanks a lot for the detailed review — really appreciate the careful feedback!

I’ve gone through and fixed the issues you highlighted:

• The locale display name has been updated to ភាសាខ្មែរ.

• The Thai-script in "common.scroll_to_top" is now corrected to proper Khmer.

• Most untranslated strings are now localized as well.
  For some of the remaining English terms (like package, dependency, version, commit, etc.), I intentionally kept them in English. These are technical terms that Khmer developers typically use directly in English when writing or talking about code. Translating them into Khmer would make the UI a little unclear, since the localized equivalents are uncommon and might not really convenience.
  In Cambodian developer contexts, mixing English for specialized technical terms is the standard and most natural choice, so I opted to follow that convention for better usability. We're looking forward to your reviewing on this new changes.

[ghostdevv]

thanks! A couple more things the LLM picked up on, let me know if any are wrong!

---

1. 🔴 Broken placeholder in a11y.approach.p2

File: i18n/locales/km-KH.json
The placeholder {about_link} doesn't match the interpolation key used by the app. Every other locale uses {about}:

Locale	Value
km-KH	គេហទំព័រនេះគឺជាគម្រោង {about_link}។ ...
fr-FR	Ce site est un {about}. ...
ja-JP	このサイトは {about} です。...
This will cause the placeholder to render as literal text or be empty at runtime.
Fix: Replace {about_link} → {about}.

---

2. 🟡 Wrong value for about.contributors.title

File: i18n/locales/km-KH.json
This key is a section heading ("Contributors"), but the Khmer value is a "show more" string with a {count} placeholder that this key never receives:

Locale	Value
km-KH	... និងអ្នកចូលរួមចំណែកចំនួន {count} នាក់ទៀត
fr-FR	Contributeurs
ja-JP	コントリビューター
Fix: Change to a simple label like អ្នកចូលរួមចំណែក ("Contributors").

---

3. 🟢 Remaining untranslated strings (non-blocking)

There are ~49 keys where km-KH has pure-English values that other locales (e.g. ja-JP) translate. The contributor's argument about keeping developer jargon in English is reasonable for some terms, but a few are general UI labels:

• nav.settings / settings.title → "settings" (ja-JP: 設定)
• footer.keyboard_shortcuts → "keyboard shortcuts" (ja-JP: キーボードショートカット)
• a11y.footer_title → "a11y" (ja-JP: アクセシビリティ)
• compare.dependencies → "Dependencies" (ja-JP: 依存関係)

[nidexingg]

@ghostdevv Kindly check the new PR. Thank you for your thorough review.