Source

File: wp-includes/l10n.php

function translate( $text, $domain = 'default' ) {
	$translations = get_translations_for_domain( $domain );
	$translation  = $translations->translate( $text );

	/**
	 * Filters text with its translation.
	 *
	 * @since 2.0.11
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( 'gettext', $translation, $text, $domain );

	/**
	 * Filters text with its translation for a domain.
	 *
	 * The dynamic portion of the hook, `$domain`, refers to the text domain.
	 *
	 * @since 5.5.0
	 *
	 * @param string $translation Translated text.
	 * @param string $text        Text to translate.
	 * @param string $domain      Text domain. Unique identifier for retrieving translated strings.
	 */
	$translation = apply_filters( "gettext_{$domain}", $translation, $text, $domain );

	return $translation;
}