That bundle is really impressive, and all seems to work well on my wiki. Made some translations without problems.
My only concern is... the translated pages doesn't display by default in the language set by the user.
i.e. if a Russian user come on my english wiki, has set "Russian" in his language Preferences, and reads a page that has a translated subpage /ru, shouldn't the wiki displays that /ru page first for him?
Maybe I'm missing a parameter? Thanks for any advice.
Topic on Talk:MediaWiki Language Extension Bundle
Due to complicated reasons it is hard to automatically redirect users to their language. But you can use Special:MyLanguage/Pagename to create such links that will redirect to that version (if it exists).