message: Add horizontal line to mail footer
diff: @@ -120,7 +120,7 @@ export class CourseUserListComponent implements OnInit, OnDestroy {
  const mailData = await this.dialogService.writeMail({
  bcc: CourseUserListComponent.getMailAddressStringForUsers(this.selectedMembers),
  cc: CourseUserListComponent.getMailAddressStringForUsers(this.course.teachers),
  - markdown: `\n\n\n\nYou received this mail because you are a ${this.role} in the course ${this.course.name}.`,
  + markdown: `\n\n\n---\nYou received this mail because you are a ${this.role} in the course ${this.course.name}.`,
  subject: `${this.course.name}: `,
  }).toPromise();
  this.toggleBlocked = false;
  