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

742	 *743	 * @param bool|null   $loaded The result of loading a .mo file. Default null.744	 * @param string      $domain Text domain. Unique identifier for retrieving translated strings.745	 * @param string      $mofile Path to the MO file.746	 * @param string|null $locale Locale.747	 */748	$loaded = apply_filters( 'pre_load_textdomain', null, $domain, $mofile, $locale );749	if ( null !== $loaded ) {750		if ( true === $loaded ) {751			unset( $l10n_unloaded[ $domain ] );752		}753 754		return $loaded;