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i18n

Configure Rails 8 I18n for translations, locales, and date/number formatting.

Updated Mar 19, 2026
Search Tags:#localization#translation#i18n#rails#locale-switching#lazy-lookup
One-click install
npx skills add https://github.com/reckerswartz/resume_builder --skill i18n-reckerswartz
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: i18n
Source: https://github.com/reckerswartz/resume_builder/tree/main/.devin/skills/i18n
Command: npx skills add https://github.com/reckerswartz/resume_builder --skill i18n-reckerswartz

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Rails apps often struggle to provide consistent translations, handle locale switching, and format dates/numbers across views and models; this skill standardizes i18n practices for Rails 8 projects.

Core Features & Use Cases

  • Translation lookups via I18n.t and t helpers across controllers, views, and models.
  • Locale management: setting default_locale, available_locales, and per-user locale preferences.
  • Formatting: date, time, and numeric localization with proper pluralization.
  • Use Cases: add multi-language support to a Rails app, localize forms, and support dynamic content in different locales.

Quick Start

Configure Rails I18n by setting default_locale and available_locales, then add locale files under config/locales and update views to use t('.key').

Frequently Asked Questions about i18n

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

FAQPage Schema
How do I add multiple language support to a Rails 8 app?▼

You can localize dates, numbers, and pluralized strings in Rails 8 by using the I18n library to manage locale files and apply the t helper. This standardizes translation lookups and formats localized content dynamically across controllers and views.

What's the best way to switch locales dynamically per user in Rails?▼

You need to configure config.i18n.default_locale, config.i18n.available_locales, and structured YAML files under config/locales to enable Rails I18n. These settings establish the baseline language environment and available translations for the application.

Can I use lazy lookup for translations across Rails controllers and models?▼

Yes, you can use lazy lookup via the t('.key') helper across Rails controllers, views, and models. This approach simplifies translation lookups by automatically scoping keys to the current controller or view path within your locale YAML files.

Why are my Rails translations showing missing translation interpolation errors?▼

Rails translation errors occur when locale YAML files under config/locales are missing required keys or config.i18n.available_locales is not properly configured. Organizing structured YAML files ensures I18n.t finds and interpolates the correct localized strings.

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