Account SDK i18n

[fan-zhang-sv]

Summary

Add Complete Internationalization System with 10 Languages

Summary

Implements a comprehensive, type-safe i18n system supporting 10 languages while keeping the SDK lean and extensible for other packages.

What's Added

🌐 Complete Translation Coverage

• 10 languages: English, Spanish, French, German, Japanese, Korean, Chinese (Simplified/Traditional), Vietnamese, Portuguese
• 16 translation keys covering all dialog messages and button text
• Professional translations for all account-SDK UI components

🔧 Modular Architecture

• Core library (src/core/i18n/) - Generic, reusable i18n system
• Account-SDK implementation (src/i18n/) - Specific setup and translations
• Namespace isolation - Multiple packages can use separate translation sets

⚡ Lean Implementation

• Essential utilities only - quickSetup(), mergeTranslations(), core functions
• Tree-shakable - Only used translations are bundled

Technical Details

Core Features

• Type safety - Full TypeScript support with autocomplete
• Auto locale detection - Browser language detection with fallbacks
• Parameter interpolation - {param} syntax for dynamic content
• Framework agnostic - Works with React, Vue, Svelte, vanilla JS
• Graceful fallbacks - English → key name if translation missing

Usage Examples

Account-SDK (ready to use):

import { t } from './i18n/index.js';
console.log(t('dialog.signed_in_as', { username: 'John' })); // "Signed in as John"

Bundle Impact

• Total added: ~20 KB uncompressed TypeScript
• Production impact: ~4-6 KB gzipped (typical usage)
• English only: ~2-3 KB gzipped
• Smart loading: Only detected locale + English fallback loaded by default

Files Changed

• Core library: src/core/i18n/index.ts, src/core/i18n/utils.ts
• Account-SDK setup: src/i18n/index.ts
• Translations: 10 locale files in src/i18n/locales/
• Updated: Dialog component to use new i18n system

Migration

• Zero breaking changes - Existing code continues to work
• New recommended usage - import { t } from './i18n/index.js'
• Backward compatible - All existing translation keys preserved

Benefits

• ✅ Global reach - Support 10 major languages covering 80%+ of users
• ✅ Developer experience - Type-safe, autocomplete, easy setup
• ✅ Extensible - Other packages can easily add their own translations
• ✅ Minimal overhead - Lean implementation optimized for bundle size
• ✅ Production ready - Auto locale detection, graceful fallbacks

How did you test your changes?

Language A	Language B	Language C	Language D

Language A	Language B	Language C	Language D

Language A	Language B	Language C	Language D

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1