In discourse/discourse#32618 we added the dependency on locales to the basic topic serializer gated behind SiteSetting.experimental_content_localization. This is so that fancy_titles can be rendered in the language of the user. Error: `ActiveModel::MissingAttributeError (missing attribute 'locale' for Topic)` This commit adds that dependency to extra_data_pluck_fields which lists fields required from the serializer.