Cannot view documents in other languages than the default when in multilingual mode and when using XWiki Syntax 2.0

The pb is that you can edit in different languages but when you view you cannot switch languages and only the main language content is displayed.
Note that there's some missing resource in edit mode for French language too:

La langue dorigine du document est {1}.

(2 pbs: missing an apostrophe and

should be translated).

BTW "Translate this document in: " should not be displayed if there's no other languages.