alias leopold_stotch -> butters_stotch

The bulk update request #13028 has been approved by @Hillside_Moose.

create alias leopold_stotch -> butters_stotch

While Leopold Stotch is Butters' full name, he's still more well known as just Butters Stotch.

The bulk update request #13028 (forum #225179) has been approved by @Hillside_Moose.