fix: date picker in edit media (#1297)

By default, Django uses type=text for the date input, which respects
the locale settings. However, when changing the input type to date,
it should only accept YYYY-MM-DD format so the input field can be
properly handled.

files/forms.py

@@ -35,7 +35,7 @@ class MediaMetadataForm(forms.ModelForm):
         widgets = {
             "new_tags": MultipleSelect(),
             "description": forms.Textarea(attrs={'rows': 4}),
-            "add_date": forms.DateInput(attrs={'type': 'date'}),
+            "add_date": forms.DateInput(attrs={'type': 'date'}, format='%Y-%m-%d'),
             "thumbnail_time": forms.NumberInput(attrs={'min': 0, 'step': 0.1}),
         }
         labels = {