I noticed there are game several Steam guides in languages not supported by the base game including: Russian, Korean and Japanese.
I also noticed that Cyrillic script support was added in 1.04.00 and there is now a Russian language translation add-on (not an official “mod”). There also seems to be a thread here about a Czech translation.
I am looking for Chinese-Japanese-Korean (CJK; aka Hangul) font support. Specifically I started work on a Japanese translation only to learn that though the game supports the translation just fine, it will not display such property. I am assuming this is a font issue.