I'm happy to announce that we are rolling out some additional features of Content Blocks. Starting from today you will now have access to a new central repository for all your content blocks. From here admins can manage all content blocks in their account across all Help Centers and locales. This also includes the ability to delete blocks as well.
You can learn more about the feature here. The feature will be available to all customers in the early access program today. Please let us know about any issues and give your feedback here in the community.