message: Add basic subject prefix and text footer
diff: @@ -120,6 +120,8 @@ export class CourseUserListComponent implements OnInit, OnDestroy {
  const mailData = await this.dialogService.writeMail({
  bcc: CourseUserListComponent.getMailAddressStringForUsers(this.selectedMembers),
  cc: CourseUserListComponent.getMailAddressStringForUsers(this.course.teachers),
  + text: `\n\n\n\nYou received this mail because you are a member of the course ${this.course.name}.`,
  + subject: `${this.course.name}: `,
  }).toPromise();
  this.toggleBlocked = false;
  if (!mailData) {
  