fix(form): tup-308 only working export formats

1. Only let users export with supported formats.
2. Update form version to rev. that supports this.

Source: avryhof/djangocms-forms#8

pyproject.toml

@@ -48,7 +48,7 @@ djangocms-blog = "1.1.1"
 djangocms-bootstrap4 = "2.0.0"
 djangocms-column = "1.11.0"
 djangocms-file = "3.0.0"
-djangocms-forms-maintained = { git = "https://github.com/avryhof/djangocms-forms", rev = "30f464303d317cf7a3170ad64e11ab4471b4287b" }
+djangocms-forms-maintained = { git = "https://github.com/avryhof/djangocms-forms", rev = "ab38b2239b93c8a275cee3b4b1a7880731486c07" }
 djangocms-googlemap = "2.0.0"
 djangocms-icon = "2.0.0"
 djangocms-link = "3.0.0"

taccsite_cms/settings.py

@@ -505,6 +505,11 @@ def get_subdirs_as_module_names(path):
     'h1', 'h2', 'h3', 'h4', 'h5', 'h6'
 ]
 
+DJANGOCMS_FORMS_FORMAT_CHOICES = (
+    ("csv", _("CSV")),
+    ("json", _("JSON")),
+)
+
 # https://github.com/nephila/django-meta
 META_SITE_PROTOCOL = 'http'
 META_USE_SITES = True