you dont need any codes it should just work as long as the one in the common5 is the same as the one in menu2 but if you have icons below the line where the usual selection things(the thing that show the csp's) you need the css fix code but that is it and it shouldnt freeze.
you posted the same thing twice and when replacing stuff just open the common5 and then replace the icons you want then right click and export the selmap to the menu2 and done.
you need both selmap and common5 put the common5 in the systems folder and selmap in the menu2 folder the with brawlbox make sure that the selmap in the common5 is the same as the on in the menu2 folder