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Story 001 – Internationalization Infrastructure

Status: TODO
Priority: MEDIUM
Estimated Effort: [TBD]
Created: 2025-12-09
Last updated: 2025-12-09 (v0.21.0.0+0 – Story created)
Version: v0.21.0.0+0
Code: E21S01

Overview​

Set up i18n infrastructure and framework for broader language support beyond UK/US English. This story establishes the foundation for multi-language support, including translation file structure, locale detection, and language switching.

Goal​

Establish a robust internationalization infrastructure that supports multiple languages, with locale detection, language switching, and locale-specific formatting. This provides the foundation for Phase 2 of FR-006 (international localization).

Task Checklist​

  • E21:S01:T01 – Choose i18n framework/library - TODO
  • E21:S01:T02 – Set up translation file structure (locales/{lang}/) - TODO
  • E21:S01:T03 – Implement locale detection (browser/system locale) - TODO
  • E21:S01:T04 – Add language switching functionality - TODO
  • E21:S01:T05 – Configure date/time/number formatting per locale - TODO
  • E21:S01:T06 – Implement translation key system - TODO
  • E21:S01:T07 – Set up translation fallback chain (selected → English → US English) - TODO

Tasks​

E21:S01:T01 – Choose i18n framework/library​

Status: TODO
Priority: HIGH
Dependencies: E21:S00 (Language Selection MVP)
Blocker: None

Input:

  • Requirements for i18n framework
  • Existing framework structure

Deliverable:

  • Selected i18n framework/library
  • Framework evaluation document
  • Integration plan

Approach:

  1. Evaluate i18n frameworks (gettext, i18next, custom solution)
  2. Consider framework requirements (file-based, key-based, etc.)
  3. Choose framework that fits ai-dev-kit structure
  4. Document selection rationale

Acceptance Criteria:

  • i18n framework selected
  • Framework evaluation documented
  • Integration plan created

E21:S01:T02 – Set up translation file structure (locales/{lang}/)​

Status: TODO
Priority: HIGH
Dependencies: E21:S01:T01
Blocker: None

Input:

  • Selected i18n framework
  • Translation requirements

Deliverable:

  • Translation file structure (locales/{lang}/)
  • File organization standards
  • Naming conventions

Approach:

  1. Design translation file structure
  2. Create directory structure for locales
  3. Define file organization (by module, by type, etc.)
  4. Document structure and conventions

Acceptance Criteria:

  • Translation file structure created
  • Directory structure organized
  • Naming conventions documented

E21:S01:T03 – Implement locale detection (browser/system locale)​

Status: TODO
Priority: MEDIUM
Dependencies: E21:S01:T02
Blocker: None

Input:

  • Translation file structure
  • Locale detection requirements

Deliverable:

  • Locale detection implementation
  • Browser/system locale detection
  • Fallback to default locale

Approach:

  1. Implement browser locale detection
  2. Implement system locale detection
  3. Create fallback to default (US English)
  4. Test locale detection

Acceptance Criteria:

  • Browser locale detection works
  • System locale detection works
  • Fallback to default works
  • Locale detection tested

E21:S01:T04 – Add language switching functionality​

Status: TODO
Priority: MEDIUM
Dependencies: E21:S01:T02, E21:S01:T03
Blocker: None

Input:

  • Translation file structure
  • Locale detection

Deliverable:

  • Language switching functionality
  • UI for language selection (if applicable)
  • Configuration update mechanism

Approach:

  1. Implement language switching logic
  2. Create language selection UI (if applicable)
  3. Update configuration on language change
  4. Reload content with new language

Acceptance Criteria:

  • Language switching works
  • Configuration updates on switch
  • Content reloads with new language
  • Language switching tested

E21:S01:T05 – Configure date/time/number formatting per locale​

Status: TODO
Priority: MEDIUM
Dependencies: E21:S01:T02
Blocker: None

Input:

  • Translation file structure
  • Locale requirements

Deliverable:

  • Locale-specific date/time formatting
  • Locale-specific number formatting
  • Formatting configuration per locale

Approach:

  1. Configure date formatting per locale
  2. Configure time formatting per locale
  3. Configure number formatting per locale
  4. Test formatting across locales

Acceptance Criteria:

  • Date formatting works per locale
  • Time formatting works per locale
  • Number formatting works per locale
  • Formatting tested across locales

E21:S01:T06 – Implement translation key system​

Status: TODO
Priority: HIGH
Dependencies: E21:S01:T01, E21:S01:T02
Blocker: None

Input:

  • Selected i18n framework
  • Translation file structure

Deliverable:

  • Translation key system
  • Key naming conventions
  • Key organization standards

Approach:

  1. Design translation key system
  2. Define key naming conventions
  3. Organize keys by module/feature
  4. Document key system

Acceptance Criteria:

  • Translation key system implemented
  • Key naming conventions defined
  • Keys organized logically
  • Key system documented

E21:S01:T07 – Set up translation fallback chain (selected → English → US English)​

Status: TODO
Priority: MEDIUM
Dependencies: E21:S01:T02, E21:S01:T06
Blocker: None

Input:

  • Translation file structure
  • Translation key system

Deliverable:

  • Translation fallback chain
  • Fallback logic implementation
  • Fallback testing

Approach:

  1. Implement fallback chain logic
  2. Fallback order: selected language → English → US English
  3. Test fallback chain
  4. Document fallback behavior

Acceptance Criteria:

  • Fallback chain implemented
  • Fallback order correct
  • Fallback tested
  • Fallback behavior documented

Acceptance Criteria​

  • i18n framework selected and integrated
  • Translation file structure established
  • Locale detection works
  • Language switching works
  • Locale-specific formatting configured
  • Translation key system implemented
  • Fallback chain works correctly

Dependencies​

Blocks:

  • Translation and Localization (Story 2)
  • Cultural Adaptation (Story 3)

Blocked By:

  • E21:S00: Language Selection at Setup (MVP)

Related Work:

  • FR-006: Localization and Language Selection (Phase 2)
  • E21:S02: Translation and Localization
  • E21:S03: Cultural Adaptation

References​

  • docs/project-management/kanban/fr-br/FR-006-localization-language-selection-uk-us-english.md - Feature request
  • packages/frameworks/kanban/templates/COMPREHENSIVE_CANONICAL_EST_STRUCTURE.md - Epic 21 canonical definition

Last updated: 2025-12-09 (v0.21.0.0+0 – Story created)