Currently game isn't translated, but people have community translations:
List of community translations:
Hello people!
The community is working hard to create the game translations in other languages until ARK has official support.
So we want to share with you the Community translations:
Russian (русский):
http://steamcommunity.com/sharedfiles/filedetails/?id=509279706
Spanish (Español):
http://steamcommunity.com/sharedfiles/filedetails/?id=508271806
Chinese (中国 / 中國):
http://steamcommunity.com/sharedfiles/filedetails/?id=505802807
http://steamcommunity.com/sharedfiles/filedetails/?id=504846625
German (Deutsche):
http://steamcommunity.com/sharedfiles/filedetails/?id=512261028
Brazilian Portuguese (Português):
http://steamcommunity.com/sharedfiles/filedetails/?id=512487017
French (Française):
http://steamcommunity.com/sharedfiles/filedetails/?id=513777959
Turkish (Türkçe):
http://steamcommunity.com/sharedfiles/filedetails/?id=514250017
Languages sorted by use, from highest to lowest.
According to the survey of Hardware and Software of Steam.
http://store.steampowered.com/hwsurvey
[GUIDE] How Translate ARK in Your Language http://steamcommunity.com/sharedfiles/filedetails/?id=512322071