There is no need to override the form_action block, as it's already d…

…oing what we want.

Quite the opposite: Adding the locale parameter to the URL at this point will result in a malformed URL, which causes a defect of the Create View.

wagtail_localize/modeladmin/templates/wagtail_localize/modeladmin/translatable_create.html

@@ -1,7 +1,5 @@
 {% extends "modeladmin/create.html" %}
 
 {% block header %}
-  {% include "wagtailadmin/shared/header_with_locale_selector.html" with title=view.get_page_title subtitle=view.get_page_subtitle icon=view.header_icon tabbed=1 merged=1 %}
+    {% include "wagtailadmin/shared/header_with_locale_selector.html" with title=view.get_page_title subtitle=view.get_page_subtitle icon=view.header_icon tabbed=1 merged=1 %}
 {% endblock %}
-
-{% block form_action %}{{ view.create_url }}?locale={{ locale.language_code }}{% endblock %}