Computer vision: yes, supports foreign languages

For computer vision training, we have added Unicode support for international character sets (ex. Japanese, Chinese, Korean, etc). This is when images of objects are uploaded via the Training API http://www.iqengines.com/apidocs/  So yes you can train the system to get a foreign language return for computer vision matches from your private training database. 

Human crowdsourcing: currently English, but Translate API is available

If human crowdsourcing is turned-on for the visual query, the system only supports English for now. Some customers are using the Google Translate API successfully to translate from English to other languages. This works in the image recognition API because the return is usually 2-4 words, so the translation reliability is fairly good.