fab-manager/app/controllers/api/translations_controller.rb

class API::TranslationsController < API::ApiController
  before_action :set_locale


  def show
    @translations = I18n.t params[:state]
    if @translations.class.name == String.name && @translations.start_with?('translation missing')
      render json: { error: @translations }, status: :unprocessable_entity
    else
      render json: @translations, status: :ok
    end
  end

  def set_locale
    I18n.locale = params[:locale] || I18n.default_locale
  end

end