Donate form context processor (#333)

* Add donate form context processor

* Try installing and collecting reverse js here

* Revert "Try installing and collecting reverse js here"

This reverts commit 1b8ae86.

Author: faucomte97

django_site/settings.py

@@ -231,6 +231,7 @@
                 "django.contrib.messages.context_processors.messages",
                 "sekizai.context_processors.sekizai",
                 "portal.context_processors.process_newsletter_form",
+                "portal.context_processors.process_donate_form",
                 "common.context_processors.module_name",
                 "common.context_processors.cookie_management_enabled",
             ],