Heli, APC & NPC kills are not appearing in the lang file, making them unable to be changed. 

Fixed by adding the following

        {
            {"newLeader", "{playername} has topped the leader board for most {ctype}" },
            {"AnimalKills", "animal kills" },
            {"ArrowKills", "kills with arrows" },
            {"ClothesCrafted", "clothes crafted" },
            {"Headshots", "headshots" },
            {"PlantsGathered", "plants gathered" },
            {"PlayersHealed", "players healed" },
            {"PlayersKilled", "players killed" },
            {"MeleeKills", "melee kills" },
            {"RevolverKills", "revolver kills" },
            {"RocketsFired", "rockets fired" },
            {"RocksGathered", "ore gathered" },
            {"BladeKills", "blade kills" },
            {"StructuresBuilt", "structures built" },
            {"StructuresRepaired", "structures repaired" },
            {"ExplosivesThrown", "explosives thrown" },
            {"WeaponsCrafted", "weapons crafted" },
            {"WoodGathered", "wood gathered" },
            {"PVEKillDistance", "longest PVE kill"},
            {"PVPKillDistance", "longest PVP kill" },
            {"NPCKills", "NPCkills"},
            {"APCKills", "APCkills"},
            {"HelicopterKills", "HelicopterKills"},
            {"QuestsCompleted", "quests completed"},
            {"UITitle", "Player Challenges   v{Version}" },
            {"UIDisabled", "The UI has been disabled as there is a error in the config. Please contact a admin" },
            {"dataWipe", "You have wiped all player stats and titles" }
        };​