Good afternoonWrite to the user a personal message, or make a changeset comment explaining that this is no acceptable data source. Revert the changeset. Probably we should contact the user in German, I don't know if he/she understands English. I can write in German if you are not fluent in German. I can also revert the changeset if you don't know how to do this.
I just found the following changeset:
Chaneset: 36207504