i18n : menu tag in xdoc does not work with "key" translated text id

with Maven 1.1-beta-1 and maven-xdoc-plugin-1.9.1

I can't get the menu names with translation.

In navigation.xml, I have set :
<menu name="TOTO">
<item key="xdocs.menu.main.about.tit01"
bundle="xdocs"
href="/index.html" >
</item>
</menu>
<menu key="xdocs.menu.main.about.tit01"
bundle="xdocs">
<item key="xdocs.menu.main.about.tit01"
bundle="xdocs"
href="/index.html" >
</item>
</menu >

Result : I've got the "TOTO" in the menu, but nothing (empty line, just the underlining) for the menu defined with the key.

Note : The <item> tag works fine with the same key (xdocs.menu.main.about.tit01)