How can you use live chat support on non-English or multi-lingual websites?
Some live chat tools support various languages with their chat widgets. You simply set the language and you are ready to go.
If your website has sub-areas in different languages you may have to adapt the widget's code and install it for each language separately. Some live chat tools (Olark for example) allow you to customize the labels on the chat widget. Like this you simply state which languages you offer right on the chat widget.