There are different filenames in the ewikidefault order in the english-version and in the german version. For example wikiword and wikiwort. It is no problem to delete the english file in the german language area for the use of the wiki. But the moodle language control says then, there are missing files.
The best option will be to use the same file name in all language versions. But the understanding in the language is not the best. Is it possible that the moodle language control doesn't check this order?
Also I found a lot of information in the wiki that is not really used in moodle or only used by admins. While translating a complete german version I will test to delete this informations and edit a new information base for the students as default files.