International Languages
As far as I can find so far Catan has been released in the following 38 languages.
Afrikaans, Arabic, Basque, Brazilian, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Icelandic, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Taiwanese, Thai, and Turkish
Currently I have 36 and am missing the Afrikaans and Brazilian versions of the game. However it is likely that other languages have been released or are under way.