Build IWBUMS 35.9:   Fixed skill requirement on upgrading metal wall level 2 Fixed Build 34's alarm clock loaded into build 35 crash. Made some fixes in the tutorial/improve it. If you killed zero or one zombie, write "zombie" and not "zombies" in the death screen. Added missing "metal bar barricade" translation in context menu. Barricade context menu becomes now Barricade (Planks) "EXIT" -> "QUIT", "RETURN" -> "RESUME" in Main menu