Korean, Japanese, and Vietnamese are all already available.
Forgive my ignorance, but are traditional Chinese and simplified Chinese different from Mandarin and Cantonese, which are already available?
There is just the one written language in China which was the traditional Chinese for thousands of years. Then the communist came along and simplified Chinese came into being. Essentially each word is simplified so that less pen stroke made up a word. This means that new learners should be able to write more quickly and learn faster. However in visually the traditional Chinese is more beautiful as they truely evolved from pictograms. The simplified strokes destroyed some of the visual impact. The spoken languages are however very varied and tonal sounds could be very different. Local slangs can make a dialect very difficult to understand too. The regional dialects like Mandarin (=Puttonghua) and Cantonese dominates the spoken dialects. Mandarin is the official spoken language in China. However the Cantonese is pervasive with overseas Chinese plus of course the entire province of Canton (=Gwangzhou). This means that countries like Canada, England, USA have local Cantonese stations. Other popular dialects are Hokkien (spoken in the Fukien region) , Shanghainese, Hakka, Chiuchau...on and on. Therefore in text form the Chinese language is always represented by traditional and simplified Chinese. Traditional Chinese is always used in Taiwan, Macao and Hong Kong. The Japanese Kanji and Korean Kanji are always traditional Chinese. Simplified Chinese is used Peoples' Republic of China. I would suggest that make/keep Taiwan and Macao as distinct "locations". They always use traditional Chinese.