1. Open your Steam Library
2. Right-click the game title and select Properties.
3. Go to the Language tab
4. Select the language you wish to use from the drop-down menu

Source: Steam Community (opens in a new tab)
1. Open your Steam Library
2. Right-click the game title and select Properties.
3. Go to the Language tab
4. Select the language you wish to use from the drop-down menu

Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.