- fine-tune knewstuff2_test do not download when we don't want download
- fix the i18n-id mechanism: if assumption holds that languages only get added, it works now

Interestingly, if Hotstuff is optimised to only deliver in the most-wanted user language, the identification will still fail. There's no way around that. Very bad - do we really need a server-generated id?

Also of interest is that KIO doesn't use the same language preference which is used in Konqueror. Will have to find the reason.