Both buttons have the same name

This releates to:
https://bugs.mojang.com/browse/MC-65488

This bug is harder to fix in pc since there is only this string in pc:
tile.button.name

But I know that there are two different strings in mcpe.
So I suggest:
"Stone Button"
"Wooden Button"
like here: http://minecraft.gamepedia.com/Button#Crafting