The main language of the MisesWiki is English. There are (at least at the moment) no separate wikis for other languages. However, if you wish to create wiki pages in a different language, create a page with a title like Term (Language). A speaker of Spanish could for example create an article at American Civil War (Spanish), or perhaps American Civil War (español), with links to and from the English version of the same article.
Note for francophone speakers: there is a large wiki in French named Wikibéral. Discussions about cooperation are pending.
As for larger works, such as books, the Translations of Libertarian Texts page is compiling lists of libertarian texts in different languages.
New articles in Italian have been created, including: