message: API: Clarify some notification test descriptions
diff: @@ -189,11 +189,11 @@ describe('Notifications', async () => {
  res.body.message.should.be.equal(errorCodes.notification.targetUserNotFound.text);
  });
  - it('should create notifications for student with changedCourse and text', async () => {
  + it('should create notifications for a student, with course-targetType and text', async () => {
  await changedCourseSuccessTest(await preparePostChangedCourseSetup());
  });
  - it('should create notifications for student with changedCourse and text', async () => {
  + it('should create notifications for a student, with course-targetType and text', async () => {
  const setup = await preparePostChangedCourseSetup();
  await new NotificationSettings({
  @@ -206,7 +206,7 @@ describe('Notifications', async () => {
  await changedCourseSuccessTest(setup);
  });
  - it('should create notifications for student with changedCourse, changedLecture, changedUnit and text', async () => {
  + it('should create notifications for a student, with unit-targetType and text', async () => {
  const {course, student, teacher} = await preparePostChangedCourseSetup();
  const lecture = await FixtureUtils.getRandomLectureFromCourse(course);
  const unit = await FixtureUtils.getRandomUnitFromLecture(lecture);
  @@ -222,7 +222,7 @@ describe('Notifications', async () => {
  await changedCourseSuccessTest({course, student, teacher, newNotification});
  });
  - it('should create notifications for student with changedCourse and text but API_NOTIFICATION_TYPE_NONE', async () => {
  + it('should create notifications for a student, with course-targetType and text but API_NOTIFICATION_TYPE_NONE', async () => {
  const setup = await preparePostChangedCourseSetup();
  await new NotificationSettings({
  @@ -235,7 +235,7 @@ describe('Notifications', async () => {
  await changedCourseSuccessTest(setup);
  });
  - it('should create notifications for student with text only', async () => {
  + it('should create notifications for a student, with text only', async () => {
  const {student, teacher} = await preparePostSetup();
  const newNotification = {
  