message: Fix UnitService API path
diff: import {Injectable} from '@angular/core';
  import {BackendService} from './backend.service';
  import {Dependency} from '../../about/licenses/dependency.model';
  -import {ITask} from '../../../../../../shared/models/task/ITask';
  import {ITaskUnit} from '../../../../../../shared/models/units/ITaskUnit';
  abstract class DataService {
  @@ -156,7 +155,7 @@ export class LectureService extends DataService {
  @Injectable()
  export class UnitService extends DataService {
  constructor(public backendService: BackendService) {
  - super('unit/', backendService);
  + super('units/', backendService);
  }
  addTaskUnit(taskUnit: ITaskUnit, lectureId: string) {
  