Updated: Comment #0
Problem/Motivation
Some schema is missing for the committed #1833022: Change notice: Only display interface language detection options to customize more granularity
Proposed resolution
core/modules/system/config/schema/system.schema.yml should have a schema snippet for system.language.types
Remaining tasks
TBD
for hints on adding and reviewing, please read #1910624: [META] Introduce and complete configuration schemas in all of core
User interface changes
No.
API changes
No.