close #37, the problem was that the user id was not set in the session when you connect the first time, just after register
added a bit more explicit message when an error while translating appears
close #34 now most of page will bring a 404 or redirect if they involve a non-existing article
removed the name of the article in the link to show a given version of an article, as it could be misleading for people that a version number are not 'by article'