[ext] update German translation
[ext] update German translation

haiwen/seafile-client,losingle/seafile-client,losingle/seafile-client,lucius-feng/seafile-client,haiwen/seafile-client,lucius-feng/seafile-client,losingle/seafile-client,haiwen/seafile-client,lucius-feng/seafile-client,haiwen/seafile-client,losingle/seafile-client,lucius-feng/seafile-client