Issue #2314855 by Crell: Standardize block entity route names.

core/includes/menu.inc

core/modules/block/block.links.contextual.yml

core/modules/block/block.links.task.yml

core/modules/block/block.routing.yml

core/modules/block/src/Entity/Block.php

core/modules/block/tests/src/Menu/BlockLocalTasksTest.php

core/modules/language/language.module

core/modules/system/entity.api.php

core/modules/system/system.module