Merge remote-tracking branch 'origin/dev' into feature/own-learning-objects

# Conflicts:
#	backend/package.json
#	backend/src/config.ts
#	backend/src/controllers/learningObjects.ts
#	backend/src/controllers/learningPaths.ts
#	backend/src/data/content/attachment-repository.ts
#	backend/src/data/content/learning-object-repository.ts
#	backend/src/data/content/learning-path-repository.ts
#	backend/src/data/repositories.ts
#	backend/src/entities/content/learning-path.entity.ts
#	backend/src/exceptions.ts
#	backend/src/routes/learning-objects.ts
#	backend/src/services/learningObjects.ts
#	backend/src/services/learningPaths.ts
#	backend/src/util/apiHelper.ts
#	backend/src/util/envvars.ts
#	package-lock.json

backend/src/exceptions.ts

@@ -9,6 +9,26 @@ export class BadRequestException extends Error {
     }
 }
 
+/**
+ * Exception for HTTP 401 Unauthorized
+ */
+export class UnauthorizedException extends Error {
+    status = 401;
+    constructor(message: string = 'Unauthorized') {
+        super(message);
+    }
+}
+
+/**
+ * Exception for HTTP 403 Forbidden
+ */
+export class ForbiddenException extends Error {
+    status = 403;
+    constructor(message: string = 'Forbidden') {
+        super(message);
+    }
+}
+
 /**
  * Exception for HTTP 404 Not Found
  */