I am an English speaker, so I chose English as the language of the program. However, several of the error messages posted by the program appear in German. I don't know what they mean.
Yes, this is a problem with many of Magix' programs, including small parts of manuals that show up in German. When that happens, I use Google Translate. Sometimes, I capture the screens and put together a bug report showing what, where and how, and raise a ticket with Magix. You may want to do the same.