Common-voice: Move 400 German sentences attributed to @jf99 to anonymous file

[mikehenrty]

see https://github.com/mozilla/voice-web/pull/1021#issuecomment-392259196

[jf99]

Not anonymous actually. I searched my browser history and found its source:
https://discourse.mozilla.org/t/question-about-multi-language-support/28385/5

[Gregoor]

I just have to mention again what an absolute joy those sentences are @jf99. It really makes the whole thing so much more fun, thank you!

[jf99]

Thank you :) I had my joy as well. Just spent an hour of listening to people who said, what I told them to say. Some people talk precise and clinical, others sing, whisper or act in a role. This is so awesome!