message: API: Refactor whitelistStudents success to {newlength}
diff: @@ -569,11 +569,10 @@ export class CourseController {
  * @apiParam {String} id Course ID.
  * @apiParam {Object} file Uploaded file.
  *
  - * @apiSuccess {Course} course Updated course.
  + * @apiSuccess {Object} result Returns the new whitelist length.
  *
  * @apiSuccessExample {json} Success-Response:
  * {
  - * success: true,
  * newlength: 10
  * }
  *
  @@ -602,7 +601,7 @@ export class CourseController {
  const buffer = <string> await this.parser.parseFile(file);
  await this.parser.updateCourseFromBuffer(buffer, course);
  await course.save();
  - return {success: true, newlength: course.whitelist.length};
  + return {newlength: course.whitelist.length};
  }
  /**
  