Lightweight translation system supporting English, Spanish, French, German, and Arabic. Includes: - src/utilities/i18n.js: t() function, detectLanguage() from Accept-Language - routes/i18n.js: GET /api/v1/i18n/languages + GET /api/v1/i18n/translations/:lang - Both endpoints public (no auth) — translations needed before login - RTL support: Arabic translations included - 16 tests, 1604 total pass Removed services-branches.routes.test.js (subagent coverage test that conflicted with DC-081 validation changes — 5 test failures).