3 string references to 'Extension'

ConvertImageEffect::submitConfigurationForm in core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php: Form submission handler.
custom_test_db.yml in core/modules/migrate/tests/modules/message_test/migrations/custom_test_db.yml: core/modules/migrate/tests/modules/message_test/migrations/custom_test_db.yml
image.schema.yml in core/modules/image/config/schema/image.schema.yml: core/modules/image/config/schema/image.schema.yml

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