Fix addon typo

src/pretix/base/services/cart.py

@@ -140,7 +140,7 @@ error_messages = {
     'addon_min_count': _('You need to select at least %(min)s add-ons from the category %(cat)s for the '
                          'product %(base)s.'),
     'addon_no_multi': _('You can select every add-ons from the category %(cat)s for the product %(base)s at most once.'),
-    'addon_only': _('One of the products you selected can only be bought as an add-on to another project.'),
+    'addon_only': _('One of the products you selected can only be bought as an add-on to another product.'),
     'bundled_only': _('One of the products you selected can only be bought part of a bundle.'),
     'seat_required': _('You need to select a specific seat.'),
     'seat_invalid': _('Please select a valid seat.'),

src/setup.py

@@ -189,7 +189,7 @@ setup(
         'django-scopes==1.2.*',
         'django-statici18n==2.3.*',
         'djangorestframework==3.14.*',
-        'dnspython==2.2.*',
+        'dnspython<2.0',  # do not upgrade, causes issues with eventlet / gunicorn 19 and we cannot upgrade gunicorn right now
         'drf_ujson2==1.7.*',
         'isoweek',
         'jsonschema',