[MOV] website, http_routing: move translation support in http_routing

Code managing language in URLs and redirection is moved from website
to http_routing. Override of _dispatch in website now consists in adding
website to the request.

url_for and is_multilang_url tools methods are also moved from website
to http_routing.ir_http as those are required for the moved code.

Some renaming is performed on request attributes previously added in
website. Indeed as website keyword may be misleading now a renaming
has been performed to better understand them :

 * request.website_enabled -> request.is_frontend
 * request.website_multilang -> request.is_frontend_multilang
 * request.httprequest.cookies.get('website_lang') -> ('frontend_lang')
 * first_pass variable in _dispatch is replaced by a new attribute of
   request, routing_iteration, that is the number of routing iterations
   currently done

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