Issue #2281905 by Berdir: Stop caching plugin discovery/info hooks by language.

core/core.services.yml

core/lib/Drupal/Core/Action/ActionManager.php

core/lib/Drupal/Core/Archiver/ArchiverManager.php

core/lib/Drupal/Core/Condition/ConditionManager.php

core/lib/Drupal/Core/Entity/EntityManager.php

core/lib/Drupal/Core/Field/FieldTypePluginManager.php

core/lib/Drupal/Core/Field/FormatterPluginManager.php

core/lib/Drupal/Core/Field/WidgetPluginManager.php

core/lib/Drupal/Core/ImageToolkit/ImageToolkitManager.php

core/lib/Drupal/Core/Mail/MailManager.php

core/lib/Drupal/Core/Menu/ContextualLinkManager.php

core/lib/Drupal/Core/Menu/LocalActionManager.php

core/lib/Drupal/Core/Menu/LocalTaskManager.php

core/lib/Drupal/Core/Plugin/DefaultPluginManager.php

core/lib/Drupal/Core/TypedData/TypedDataManager.php

core/lib/Drupal/Core/Validation/ConstraintManager.php

core/modules/aggregator/aggregator.services.yml

...modules/aggregator/src/Plugin/AggregatorPluginManager.php

core/modules/block/block.services.yml

core/modules/block/src/BlockManager.php