Has there any research been done on how difficult certain languages are to learn for chatbots? For example, CleverBot knows a bit of Dutch, German, Finnish and French, so there are clearly chatbots that speak other languages than English. (English is still her best language, but that is because she speaks that most often)I would imagine that a logical constructed language, like lobjan, would be easier to learn than a natural language, like English, for example.  
Are there any results on how difficult certain languages are to learn for chatbots?
chat bots;language processing