manager: fix site_json field label (#52200)

src/authentic2/manager/forms.py

@@ -674,7 +674,11 @@ class UserChangeEmailForm(CssClass, FormWithRequest, forms.ModelForm):
 class SiteImportForm(forms.Form):
     file_field_label = _('Site Export File')
 
-    site_json = forms.FileField(label=file_field_label)
+    site_json = forms.FileField()
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['site_json'].label = self.file_field_label
 
     def clean_site_json(self):
         try:

tests/test_ou_manager.py

@@ -59,6 +59,7 @@ def test_manager_ou_import(app, admin, ou1, role_ou1, ou2, role_ou2):
 
     resp = app.get('/manage/organizational-units/')
     resp = resp.click('Import')
+    assert 'Organizational Units Export File' in resp.text
     resp.form['site_json'] = Upload('export.json', json.dumps(export).encode(), 'application/json')
     resp = resp.form.submit().follow()