[V2 200pts] Add Hausa (HA) language translation — full messages/ha.json covering all keys from messages/en.json

[portableDD]

Summary

Add Hausa language translation to NexaFx. Hausa is the most widely spoken language in northern Nigeria and is one of the three priority expansion languages for the platform. This builds on the i18n infrastructure from issue #45 (next-intl setup and messages/en.json).

Prerequisites

• Issue Update Contribution.md #45 (i18n setup) must be completed and merged before this issue is started
• messages/en.json must exist with all English strings already extracted

What Needs to Be Done

1. Create messages/ha.json

Translate every key from messages/en.json into Hausa. The file structure must be identical to en.json — same keys, Hausa values.

Key translations to prioritise:

{
  "auth": {
    "login": {
      "title": "Shiga NexaFx",
      "emailLabel": "Adireshin imel",
      "passwordLabel": "Kalmar sirri",
      "submitButton": "Shiga",
      "forgotPassword": "Manta da kalmar sirri?",
      "noAccount": "Ba ku da asusun?",
      "signUp": "Yi rajista"
    }
  },
  "dashboard": {
    "balances": {
      "title": "Gibin ku",
      "error": "Ba a iya loda gibin — don Allah sake sabuntawa",
      "empty": "Ba a sami gibin ba"
    }
  }
}

(Continue for all keys in en.json.)

2. Update language switcher

In components/shared/language-switcher.tsx:

• Enable Hausa: { code: 'ha', label: 'Hausa (HA)', enabled: true }
• Remove "Coming soon" disabled state for Hausa

3. RTL check

Hausa is written left-to-right — no RTL changes needed. Confirm this in the PR description.

4. Translation quality

• All translations must be natural Hausa, not machine-translated without review
• If any string is difficult to translate directly, use a clear descriptive Hausa equivalent
• Leave a comment // TODO: verify translation next to any uncertain entries

Acceptance Criteria

• messages/ha.json covers every key in messages/en.json
• Switching to Hausa in the language switcher renders the full UI in Hausa
• No English strings visible anywhere in the UI when Hausa is selected
• Language switcher shows Hausa as an enabled option (not "Coming soon")
• npm run build and npm run lint pass

---

⚠️ IMPORTANT — READ BEFORE SUBMITTING YOUR PR
Your pull request MUST target the v2 branch.
PRs targeting main or any other branch will not be reviewed and will not be merged.

Base branch: v2   ✅
Base branch: main ❌  → will be closed without review

Complexity: High — 200 points

[Osuolale1]

@Osuolale1 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I have experience with next-intl and localization. I’ll add a complete Hausa (messages/ha.json) translation matching all keys in messages/en.json, verify consistency, and ensure the translations integrate correctly.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Osuolale1 to this issue.

[ahmadogo]

@ahmadogo has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello Maintainer!!
I am a software engineer and an open source contributor. I would like to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ahmadogo to this issue.

[drips-wave]

Congratulations, @ahmadogo! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @ahmadogo: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been completed by @ahmadogo as part of the Stellar Wave Program's 7th Wave 🥳

😎 @ahmadogo: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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