wp-includes/l10n/class-wp-translation-controller.php:354Normalizes header names to be capitalized.
$headerstringstring protected function normalize_header( string $header ): string { $parts = explode( '-', $header ); $parts = array_map( 'ucfirst', $parts ); return implode( '-', $parts ); }Introduced in 6.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/l10n/class-wp-translation-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.