[BE-27] Add localized (i18n) email template support

[mftee]

Overview

Send notification emails in the user preferred language (English and French minimum) inside backend/cmmty/.

Acceptance Criteria

• Create backend/cmmty/i18n-mail/ with translation files and localized mail service
• Support at least 2 languages: English (default) and French
• Translate: welcome email, risk alert, verification complete
• Detect language from a language field on the user entity
• Write unit tests for language selection logic

Contribution Folder

All files must be placed inside backend/cmmty/. Do not modify any file outside this folder.

How to Contribute

Comment on this issue to express interest, fork the repo, build inside backend/cmmty/ only, and open a PR targeting main.

[Cedarich]

@Cedarich has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello maintainer, please can i take up this task

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

[naijadatagirl]

@naijadatagirl has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello,

I’d like to work on Issue #353 in the SMALDA repository. Adding localized email support is a meaningful improvement for user experience, especially for ensuring users receive notifications in their preferred language.

My approach will be to create a dedicated backend/cmmty/i18n-mail/ module containing translation files and a localized mail service. I will implement support for at least English (default) and French, covering the required templates: welcome email, risk alert, and verification complete.

The service will detect the user’s preferred language from the user entity and fall back to English when necessary. I will also add unit tests to validate language detection and template selection logic, ensuring correctness across supported scenarios.

All changes will strictly remain within the backend/cmmty/ directory as required, with clean structure and maintainable code.

Best regards,
Naijadatagirl

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

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Congratulations, @Cedarich! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Cedarich: 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.

Warning

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[drips-wave]

This issue has been completed by @Cedarich as part of the Stellar Wave Program's 4th Wave 🥳

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