message: fix user service URL
diff: @@ -5,7 +5,7 @@ import { Observable } from 'rxjs';
  import { User } from './user';
  import { environment } from '../../../environments/environment';
  -const userUrl = `${environment.backend_url}/api/user`;
  +const userUrl = `${environment.backend_url}/api/users`;
  @Injectable()
  export class UserService {
  @@ -16,7 +16,7 @@ export class UserService {
  // only active users are retrieved
  getUsers() {
  - const url = userUrl + '/all/active';
  + const url = userUrl + '/active';
  return this.http.get(url);
  }
  