WordPress at a glance
filter is not described

core_version_check_locale filter-hook . WP 2.8.0

Filters the locale requested for WordPress core translations.

Usage

add_filter( 'core_version_check_locale', 'filter_function_name_1601' );
function filter_function_name_1601( $locale ){
	// filter...

	return $locale;
}
$locale(string)
Current locale.

Where the hook is called

wp_version_check()
wp-includes/update.php 64
$locale = apply_filters( 'core_version_check_locale', get_locale() );

Where the hook is used (in WP core)

Does not used.