Dserver Optimization for better Performance

[=TBAS=Sshadow14]

Hello server owners and rest.

Just something little i recently noticed when i was cleaning old multiplayer files from game folder.

Dserver.exe Sends the mission briefing file in ALL Languages its written in (be that 2 or 10)
All language files are needlessly downloaded when only 1 is needed.
While yes its only a small files (under 50kb) There is still the point that during connection you might have upto 50-60 people requesting these files and the server than must answer these and upload the files.

A Small optimization would be great as dserver already struggles when 20 people all trying to join same time.

Optimization:
To have Dserver read the clients Game language or Windows Language & only send the 1 correct file