I perfectly understand Anja's frustration in discovering that translations are lost on the server. We take the matter very seriously and since we have backup files there is a good chance that any lost translations can be recovered. I encourage other translators to visit /acs-lang/admin on the translation server, examine the untranslated messages for each package in their respective locale and please let me know if there are lost translations.
Ok. I think there was a misunderstanding concerning the backups, sorry. I'll see what I/you might do. (The problem is, though, that there are a lot of messages that I just quality checked or edited, so the translations are not 'lost' in the sense that there is no translation, and these messages will probably be difficult to find out (?).)