About Multilingual in WordPress…

Bilingual or Multilingual is not supported by WordPress. There are however Plugins developed by the WordPress community which will allow you to create a multilingual blog easily.
By the use of multilingual blog is basically installing WordPress in more than one language and letting the Plugin switch between them. This includes installing languages files which most Plugins will require you to do manually.
Multilingual plugins that assign a single language per post will let the user select the post’s language and add translations as new posts (same for pages, tag and categories).
Then, different versions of the same content are linked together to form translation groups. This grouping allows users to switch the display language.