style: fix linting issues met ESLint

backend/tests/test_assets/assignments/groups.testdata.ts

@@ -8,7 +8,7 @@ export function makeTestGroups(em: EntityManager): Group[] {
      * Group #1 for Assignment #1 in class 'id01'
      * => Assigned to do learning path 'id02'
      */
-    // gets deleted
+    // Gets deleted
     group01 = em.create(Group, {
         assignment: getAssignment01(),
         groupNumber: 21001,

backend/tests/test_assets/assignments/submission.testdata.ts

@@ -71,7 +71,7 @@ export function makeTestSubmissions(em: EntityManager): Submission[] {
         content: '',
     });
 
-    // gets deleted
+    // Gets deleted
     submission07 = em.create(Submission, {
         learningObjectHruid: testLearningObject01.hruid,
         learningObjectLanguage: testLearningObject01.language,

backend/tests/test_assets/classes/classes.testdata.ts

@@ -39,7 +39,7 @@ export function makeTestClasses(em: EntityManager): Class[] {
     const studentsClass04: Student[] = [getNoordkaap(), getDireStraits()];
     const teacherClass04: Teacher[] = [getStaind()];
 
-    // gets deleted in test
+    // Gets deleted in test
     class04 = em.create(Class, {
         classId: 'Q8N5YC', // 33d03536-83b8-4880-9982-9bbf2f908ddf
         displayName: 'class04',

backend/tests/test_assets/classes/teacher-invitations.testdata.ts

@@ -26,7 +26,7 @@ export function makeTestTeacherInvitations(em: EntityManager): TeacherInvitation
         status: ClassStatus.Open,
     });
 
-    // gets deleted in test
+    // Gets deleted in test
     teacherInvitation04 = em.create(TeacherInvitation, {
         sender: getFooFighters(),
         receiver: getLimpBizkit(),

backend/tests/test_assets/content/attachments.testdata.ts

@@ -4,7 +4,7 @@ import { testLearningObject01 } from './learning-objects.testdata';
 import { LearningObject } from '../../../src/entities/content/learning-object.entity';
 
 export function makeTestAttachments(em: EntityManager): Attachment[] {
-    // prevent duplicate insertion
+    // Prevent duplicate insertion
     const lo = em.merge(LearningObject, testLearningObject01);
 
     attachment01 = em.create(Attachment, {

backend/tests/test_assets/questions/answers.testdata.ts

@@ -20,7 +20,7 @@ export function makeTestAnswers(em: EntityManager): Answer[] {
         content: 'answer2',
     });
 
-    // gets deleted
+    // Gets deleted
     answer03 = em.create(Answer, {
         author: getLimpBizkit(),
         toQuestion: getQuestion04(),

backend/tests/test_assets/questions/questions.testdata.ts

@@ -27,7 +27,7 @@ export function makeTestQuestions(em: EntityManager): Question[] {
         content: 'question',
     });
 
-    //gets deleted
+    //Gets deleted
     question03 = em.create(Question, {
         learningObjectLanguage: testLearningObject04.language,
         learningObjectVersion: testLearningObject04.version,