apply_filters( 'pre_load_textdomain', bool|null $loaded, string $domain, string $mofile, string|null $locale )

743	 *744	 * @param bool|null   $loaded The result of loading a .mo file. Default null.745	 * @param string      $domain Text domain. Unique identifier for retrieving translated strings.746	 * @param string      $mofile Path to the MO file.747	 * @param string|null $locale Locale.748	 */749	$loaded = apply_filters( 'pre_load_textdomain', null, $domain, $mofile, $locale );750	if ( null !== $loaded ) {751		if ( true === $loaded ) {752			unset( $l10n_unloaded[ $domain ] );753		}754 755		return $loaded;