Merge branch '34-der-code-soll-nur-aus-zahlen-bestehen' into 'master'

Resolve "Der Code soll nur aus Zahlen bestehen!"

Closes #34

See merge request enrichment-2024/qivip!10

core/play/models.py

@@ -16,7 +16,7 @@ class QuizGame(models.Model):
 
     def generate_unique_code(self):
         for i in range(10):
-            new_code = ''.join(random.choices(string.ascii_letters + string.digits, k=6))
+            new_code = ''.join(random.choices(string.digits, k=6))
             if not QuizGame.objects.filter(join_code=new_code).exists():
                 return new_code