remove LatestVersionCardAPI content_type

Modules/APIs.py

@@ -82,7 +82,4 @@ class LatestVersionCardAPI(PageBase):
         setter = kwargs.get('setter')
         card = self.project.base_library.get_card('VersionLatestListCard', False)
         card = setter.decorate(card)
-        return self.project.template_manager.build(card)
-
-    def get_content_type(self, setter):
-        return 'text/plain'
+        return self.project.template_manager.build(card)