Merge remote-tracking branch 'origin/dev' into feat/questions-answers-en-submissions-groep-specifiek-maken-#163

# Conflicts:
#	backend/src/controllers/questions.ts
#	backend/src/controllers/submissions.ts
#	backend/src/data/questions/question-repository.ts
#	backend/src/interfaces/group.ts
#	backend/src/interfaces/question.ts
#	backend/src/interfaces/submission.ts
#	backend/src/routes/submissions.ts
#	backend/src/services/groups.ts
#	backend/src/services/questions.ts
#	backend/src/services/students.ts
#	backend/src/services/submissions.ts
#	common/src/interfaces/question.ts

backend/src/data/assignments/submission-repository.ts

@@ -18,6 +18,14 @@ export class SubmissionRepository extends DwengoEntityRepository<Submission> {
         });
     }
 
+    public async findByLearningObject(loId: LearningObjectIdentifier): Promise<Submission[]> {
+        return this.find({
+            learningObjectHruid: loId.hruid,
+            learningObjectLanguage: loId.language,
+            learningObjectVersion: loId.version,
+        });
+    }
+
     public async findMostRecentSubmissionForStudent(loId: LearningObjectIdentifier, submitter: Student): Promise<Submission | null> {
         return this.findOne(
             {