(The “Welcome first post” translations are kept in ja.po of japanese WP installation download kit – Please question or comment in english… !
Here is only for demo – but the child theme kit presented in “how to” post series about multilingual website contains japanese flag.
Goma says : (translation via Google – I don’t speak Japan) Want to post in Japanese, I activate the plugin will not work. Try a little luck.
I says : after activating xili-language plugin, you must prepare some files and settings before creation a multilingual cms website as here. With few knowledges in WP, you obtain a powerful site ! Because WP + xili-language don’t translate and only indexes (taxonomy) the authors must write (or translate) in target languages !