This is a way to make the RU/CIS version of the game, into English.



If you have STEAM:
1. Go to folder Steam/Steamapps/Common/Tom Clancy's Rainbow Six Siege RUS or where's your game's located
2. Paste the file localization.lang by overwriting original file
If you have UPLAY:
1. Go to folder Ubisoft Game Launcher/Games/Tom Clancy's Rainbow Six Siege RUS or where's your game's located
2. Paste the file localization.lang by overwriting original file
Result: Now your in-game text will be in English

Changing sounds and voice in game
If you have STEAM:
1. Go to folder Program Files/Steam/Steamapps/Common/Tom Clancy's Rainbow Six/ Siege/Sounddata/pc
2. Delete files sounds_rus.pck and sounds_rus_playgo.pck
3. Now paste both files downloaded file from links above
Result: Now your sounds are in English
If you have UPLAY:
1. Go to folder Program Files/Ubisoft/Ubisoft Game Launcher/Games/Tom Clancy's Rainbow Six Siege/Sounddata/pc
3. Now paste both files downloaded file from links above

Moreover, some Uplay/Steam users don't have any in-game voice
To fix this edit your streaminginstall.ini file located in game directory with following values:
sounddata/pc/sounds_rus_playgo.pck=1
sounddata/pc/sounds_rus.pck=2
sounddata/pc/sounds_eng_playgo.pck=17
sounddata/pc/sounds_eng.pck=18
This will make all your in-game content in English language.
Hope this will help all players who had this problem