Yes, you can use many foreign/international characters with liveSite. liveSite currently supports the ISO 8859-1 character encoding, which includes support for many foreign characters. We hope to add support for the UTF-8 character encoding in the future, which supports all foreign characters.
If you need to use characters which are not supported by ISO 8859-1, then there are some solutions to that.
If you are having issues with HTML entities (e.g. &example;) appearing in Menu Item names, there is a customization we can add for you to resolve that one issue. Alternatively, we can also customize your site to have full UTF-8 support. Please feel free to contact our sales department for more information.