Running a stock trading software for Chinese traders, trading in US equities, is not an easy task. There are several factors that come into play. If you were running such an operation you would need to have all set up things like market data feeds which have the rights to be distributed internationally, high speed data lines and servers located in reputable data centers, and all of your order execution servers set up so that their orders register as valid trades to the stock exchange.
For the actual traders themselves, you would need to have your software accommodated as much as possible into the various languages. Since there is more than one type of Chinese language, you would have to have a front end platform in the primary language where you have lots of traders. You also would need to locate data that can be translated into Chinese as well as possible, minus the numerical data and the market symbols.
Regarding trading, you also would need to have the software be able to have the ability to make sure that the numbers translate into currency exchanges. Even if this is to be handled on the back end with their preferred brokerage firm, they still will want to know that current intraday exposure against the current exchange rate. This is not necessarily easy to program, so finding a reputable software which does this may be challenging.
Finally, you will want the ability to filter any stocks not permitted by the country. China may have regulations about which symbols can be traded by their residents, and the same may apply with other countries. By having middle and back office software which controls the symbols which are (or are not) allowed to be traded by a certain trading firm or trading account then you can confirm that you have the compliance issues under control.