Add config option to set locale

[d-mato]

I want to use locale ':ja' but my rails app's default_locale must be ':en'. So I tried to enable to set locale for active_admin by config file.

Usage

# config/initializers/rails_admin.rb
RailsAdmin.config do |config|
  config.locale = :ja # I18n.locale is assigned :ja only scoped for active_admin.
 ~~~
end

[mshibuya]

You have to clear RailsAdmin.config.locale, otherwise subsequent test cases fail.

[mshibuya]

This is application-specific, setting parent_controller to your custom class and changing locale there looks better.

[d-mato]

Thanks for feedback! I'll try to edit parent_controller.