Yes you will have to set your computer to translate and you do this by opening up programs and there you chance your language to for ex. chinese...是的，您必須設置您的計算機翻譯，你要做到這一點，開放的程序和有你的機會你的語言來為前戰鬥。中文.....lol.
No nothing just use English as the site is in English and those who can't read or write can use Google Translate or just keep quiet. 
if i want to chat with someone who is from another country, will they be able to read my message in their own language, or do I have to set something on my computer.