Localize: App Internationalization Workflow

Target versions (May 2026): react-i18next 15.x, vue-i18n 11.x, next-intl 4.x, i18next 25.x

Systematic approach to internationalizing applications. Covers two scenarios: adding multilingual support from scratch and auditing existing i18n for gaps. Built from real production pain - the hardest part of i18n is not translation but finding every string that needs it, and making sure translations read naturally in context rather than as mechanical word-by-word output.

When to use

• Adding multilingual support to an existing single-language app
• Auditing a codebase for untranslated hardcoded strings
• Checking an already-internationalized app for completeness or quality gaps
• Setting up locale catalogs, providers, and translation infrastructure
• Generating machine translations for new or changed source strings
• Validating catalog completeness across locales
• Adding new languages to an already-internationalized app