message: Fix double slash in mail api path
diff: @@ -249,7 +249,7 @@ export class CourseService extends DataService {
  sendMailToSelectedUsers(data: any): Promise<any> {
  return this.backendService
  - .post(this.apiPath + '/mail', JSON.stringify(data))
  + .post(this.apiPath + 'mail', JSON.stringify(data))
  .toPromise();
  }
  