block_content.local_tasks.yml

block_content.list:
  title: 'Custom block library'
  route_name: block_content.list
  base_route: block.admin_display
block_content.list_sub:
  title: Blocks
  route_name: block_content.list
  parent_id: block_content.list
block_content.type_list:
  title: Types
  route_name: block_content.type_list
  parent_id: block_content.list

block_content.edit:
  title: Edit
  route_name: block_content.edit
  base_route: block_content.edit
block_content.delete:
  title: Delete
  route_name: block_content.delete
  base_route: block_content.edit

# Default tab for custom block type editing.
block_content.type_edit:
  title: 'Edit'
  route_name: block_content.type_edit
  base_route: block_content.type_edit