An update has been released for Left 4 Dead 2.

• Quick Match option for all modes allows players to prefer "Official Servers Only" or "Any Servers"
• Added localized UI and subtitles for Vietnamese
• Increased string commands per second limit to fix some false disconnects
• Prevent manually initiating some talker responses that trigger longer conversations
• Fixed color correction for some maps where it was missing or incorrect
• Fixed melee animation while carrying a fireworks crate
• Fixed M60 not using the correct walk calm animation
• MP5 changed to the slightly better rifle reload animation
• SG552 changed to use assault rifle animations and military sniper zoom animations
• Fixed incorrect sound cue for player infected when a survivor dies
• Changed some mob onslaughts to classic panic events in the L4D mutation
• Boomer bile slows tanks in Tank Run mutation
• Several Rocket Dude mutation fixes and performance improvements
• New survivor alert response rules for intense combat situations
• Scripting: • Fire the "KilledZombie" response concept when killing a Witch. • New "EntityOutputs" class containing functions to manipulate entity output connections. ○ GetNumElements, GetOutputTable, HasOutput, HasAction, AddOutput, RemoveOutput • Expanded response rules testbed.