flash.yml

de:
  flash:
    actions:
      create:
        neuter: asdfasdfasdf
        male: a
        female: b
      

gender_helper.rb

module GenderHelper
  def flash_action(action, resource)
    gender = I18n.t(resource.name.downcase, scope: 'gender')
    
    I18n.t(gender, resource_name: resource.class.model_name.human, scope: [:flash, :actions, action])
  end
end

flash_action(:create, User)

projects.yml

de:
  gender: 
    project: :neuter