boolean to indicate whether a translation exists for a given string with optional text domain and locale.
	 *
	 * @since 6.7.0
	 *
	 * @param string  $singular   Singular translation to check.
	 * @param string  $textdomain Optional. Text domain. Default 'default'.
	 * @param ?string $locale     Optional. Locale. Default current locale.
	 * @return bool  True if the translation exists, false otherwise.
	 */
	public function has_translation( string $singular, string $textdomain = 'default', ?string $locale = null ): bool {
		if ( null === $locale ) {
			$locale = $this->current_locale;
		}

		return false !== $this->locate_translation( $singular, $textdomain, $locale );
	}
}