old-zsterminator/app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  before_action :set_locale

  private

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

  # Optional: Make locale persist across requests via URL helpers
  def default_url_options
    { locale: I18n.locale }
  end

  def set_company
    company_id = session.fetch(:company_id, Company.first&.id)
    session[:company_id] = company_id
    @company = Company.find(session[:company_id])
  end
end