Simply unpack the archive and play. Singleplayer and LAN Multiplayer are available.
Contains 32-bit libraries required for the game (some of them not so required :D) and patched libsteam_api.so

To change the game language, open ~/.local/share/aspyr-media/Sid Meier's Civilization Beyond Earth/config.ini with a text editor and change the following string according to your locale/language:

; The currently selected language.
Language = en_US

Don't mess with SteamLanguage and my2KLanguage, these won't work properly.

Have fun ;)