### Install devise-i18n Gem in Gemfile

Source: https://github.com/tigrish/devise-i18n/blob/master/README.md

This snippet shows how to add the `devise-i18n` gem to your Rails application's Gemfile. It must be placed after the `devise` gem to ensure proper dependency loading. This is the first step to integrate internationalization support for Devise views.

```Ruby
gem 'devise'
gem 'devise-i18n'
```

--------------------------------

### Define and Register Custom Locale Middleware

Source: https://github.com/tigrish/devise-i18n/blob/master/README.md

These Ruby snippets define a custom Rack middleware class, `LocaleMiddleware`, for setting the application's locale and then register it with the Rails application. This provides an alternative, application-wide method for locale management, ensuring consistent internationalization across requests.

```Ruby
class LocaleMiddleware
  def initialize(app)
    @app = app
  end

  def call(env)
    I18n.locale = :es # Or whatever logic you use to choose.
    status, headers, body = @app.call(env)
  end
end
```

```Ruby
config.middleware.use ::LocaleMiddleware
```

--------------------------------

### Generate devise-i18n Views

Source: https://github.com/tigrish/devise-i18n/blob/master/README.md

This shell command uses the Rails generator to copy all `devise-i18n`'s default views into your application. This allows for customization of the views, but it's advised only when necessary as it prevents automatic updates from future gem versions.

```Shell
rails g devise:i18n:views
```

--------------------------------

### Generate Scoped devise-i18n Views

Source: https://github.com/tigrish/devise-i18n/blob/master/README.md

This shell command generates `devise-i18n` views specific to a given scope, such as 'user'. This is useful for applications with different authentication contexts (e.g., users and admins) requiring distinct view sets. Additional translation keys will be needed for the specified scope.

```Shell
rails g devise:i18n:views user
```

--------------------------------

### Set Application Locale using before_action

Source: https://github.com/tigrish/devise-i18n/blob/master/README.md

This Ruby snippet demonstrates how to set the application's locale using a `before_action` in a Rails controller. This approach is recommended for `devise-i18n` to ensure all messages are translated correctly, especially when `I18n.with_locale` might not work due to a Warden bug.

```Ruby
before_action do
  I18n.locale = :es # Or whatever logic you use to choose.
end
```

--------------------------------

### Generate Custom devise-i18n Locale File

Source: https://github.com/tigrish/devise-i18n/blob/master/README.md

This shell command generates a specific locale file (e.g., `config/locales/devise.views.it.yml`) for `devise-i18n` into your project. This allows developers to modify or add custom translations for Devise views. Contributions of improved translations are encouraged.

```Shell
rails g devise:i18n:locale it
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.