As far as I can find Catan has been released in the following 40 language versions.

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, Macedonian, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Taiwanese, Thai, Turkish and Ukranian.

The Brazilian versions use the local spellings of Portuguese so I list them as a seperate dialect/edition. Equally I have Chinese language sets manufactured for the Taiwanese market so list these seperately too. I  also have a Turkish version of Catan produced by Kosmos that I have been unable to find details on, but list it too.

I had finally got my Afrikaans version to complete the set of languages when it was announced a new Ukranian version had been released. This is now on my list to get. There is also a new 2023 Macedonian only language set I am keen to get, although I do have Macadonian in a multi-langauge set already.