Fixed typo in "Schwierigkeitsniveau"

dav_events/forms/events.py

@@ -227,7 +227,7 @@ class ModeForm(EventCreateForm):
                                   )
 
     level = forms.ChoiceField(choices=choices.LEVEL_CHOICES,
-                              label=_(u'Schwierigkeitsnivau / Familien'),
+                              label=_(u'Schwierigkeitsniveau / Familien'),
                               widget=forms.RadioSelect())
 
     first_day = forms.DateField(required=True,