i18n

Implement Rails 8 internationalization with locale files, lazy lookups, and pluralization.

Updated Mar 3, 2026
One-click install
npx skills add https://github.com/pelletencate/iron-horse --skill i18n-pelletencate
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: i18n
Source: https://github.com/pelletencate/iron-horse/tree/main/skills/i18n
Command: npx skills add https://github.com/pelletencate/iron-horse --skill i18n-pelletencate

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Rails apps often require multi-language support and consistent translations across the UI. This skill provides a framework for implementing locale files, lazy lookups, and locale switching in Rails 8, ensuring maintainability and consistency.

Core Features & Use Cases

  • Locale management: Organize translations by domain and apply lazy lookups in views for clean templates.
  • Pluralization and formatting: Proper plural forms and date/currency formats across locales.
  • Locale switching: Seamless runtime locale changes via URL, user preference, or headers.
  • Use Case: Multilingual e-commerce app presenting product descriptions in multiple languages with correct plural rules.

Quick Start

Configure I18n in config/application.rb and add locale files under config/locales.

Frequently Asked Questions about i18n

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up Rails i18n with locale files and lazy lookups?

Configure I18n in config/application.rb and add domain-scoped locale files under config/locales to enable lazy lookups. This approach keeps translation keys consistent across models, views, and controllers, ensuring maintainability and clean templates in Rails 8 multi-language applications.

What is the best way to handle pluralization and date formatting in Rails locales?

Rails pluralization and date formatting require defining correct plural rules and format patterns within your locale files. This setup ensures proper plural forms and accurate date or currency formatting across different locales at runtime, maintaining consistency throughout the application UI.

How does locale switching work in Rails 8 for runtime language changes?

Rails locale switching enables seamless runtime language changes via URL parameters, user preferences, or HTTP headers. This allows multilingual applications to dynamically present content like e-commerce product descriptions in the user's selected language.

Does this Rails i18n setup require fallback locale configurations?

Yes, configuring fallback locales is required for handling missing translations gracefully. The setup also integrates i18n-tasks to perform health checks on your locale files, ensuring consistent I18n keys and verifying translation organization across domains.

How do I organize translations across models, views, and controllers in Rails?

Organize translations by domain scope within your locale files and apply lazy lookups in views. This structure ensures consistent I18n keys across models, views, and controllers, keeping multilingual templates clean and maintainable.