def set_language_to
      session[:lang_to] = params[:lang].to_sym
      
      respond_to do |format|
        format.html { redirect_to root_url } 
        format.js { render nothing: true }
      end
    end
def set_language_to
      session[:lang_to] = params[:lang].to_sym
      
      respond_to do |format|
        format.html { redirect_to root_url } 
        format.js { render nothing: true }
      end
    end
set language user translating to