## Description
Currently invalid or missing `accept-language` headers will cause issues
rendering Plural components since we do not validate them.
This adds a check to try filter out invalid locales.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Enhanced locale filtering process to ensure only valid locales are
processed.
- **Bug Fixes**
- Improved data integrity by preventing invalid locales from affecting
application functionality.
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