- Implemented `extract_locale_from_accept_language_header` to
retrieve the user's preferred language from the request.
- Added `sanitize_locale` for validating and sanitizing locale
inputs against available locales.
- Updated `set_locale` method to prepare for incorporating
browser language preference handling.
These changes enhance the application's ability to set the locale
based on the user's browser settings, paving the way for better
internationalization support.
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