Update 1.6.0

Lots of updates in v1.6.0!

• Added language select (Russian now available)
• Added Tutorial
• Added Napalm Grenade
• Added Napalm Airstrike
• Added new North America multiplayer server (New York City)
• Added new game mode: Battlezone
• Added new map: Factory
• Added new attachment: Booster
• Helicopters now have long-range damage drop off
• Off-screen enemy indicators are hidden when an enemy Counter-UAV or EMP is active
• Stims can now be used to heal nearby allies when player has full health
• An enemy's current killstreaks are shown when they kill you 
• Stun grenades and flashbangs now temporarily stun Dragonfires
• Increased weapon penetration deals more damage to Deployable Cover
• Final survivor in Infected receives Sleight of Hand and Scavenger perks
• New Operations
• Opening doors quietly (pressing E) will not alert enemies in Operations
• New player icons
• Added weapon delay after opening/closing doors