If you need to extend or modify the config/application.rb just do it at the config/application_custom.rb file. For example if you want to change de default language to English, just add:
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moduleConsul
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classApplication<Rails::Application
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config.i18n.default_locale =:en
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config.i18n.available_locales =[:en,:es]
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end
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end
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Remeber that in order to see this changes live you'll need to restart the server.