Wikispaces has always supported international characters inside wiki pages. Now, we’ve removed almost all restrictions on what characters you can use in the page names themselves, allowing non-Roman characters to be used.

For example, you could use the following wikitext link:
[[欢迎光临]]

And the page it links to would look like this:

The internationalized page names are supported across Wikispaces, including Recent Changes, the Visual Editor, RSS Feeds, and Email notification.