Fixed typo in "Schwierigkeitsniveau"

dav_events/models/event.py

@@ -57,7 +57,7 @@ class Event(models.Model):
                                    verbose_name=_('Skiliftbenutzung'))
     level = models.CharField(max_length=choices.CHOICE_FIELD_MAX_LENGTH,
                              choices=choices.LEVEL_CHOICES,
-                             verbose_name=_('Schwierigkeitsnivau'))
+                             verbose_name=_('Schwierigkeitsniveau'))
     first_day = models.DateField(verbose_name=_('Erster Tag'))
     alt_first_day = models.DateField(blank=True,
                                      null=True,