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This document summarizes the history and features of internationalization (i18n) support in Ruby on Rails. It discusses how i18n was initially implemented through plugins with monkey patching, leading Rails 2.2 to bundle the i18n gem for a common API without patching. The gem provides translation and localization methods, along with backends like SimpleBackend for storage. Rails now supports i18n for validation errors, forms, numbers, dates and more through the i18n helper and configuration. Resources are provided for using i18n in Rails applications.


















