“Adult” word replacement

Hello, there’s no any option for that. You need to replace the text manually.

You can use something like this:

function hotelier_custom_adults_text( $translated_text, $untranslated_text, $domain ) {
	if ( $domain !== 'wp-hotelier' ) {
		return $translated_text;
	}

	$translated_text = str_replace( 'Adults', 'Guests', $translated_text );
	$translated_text = str_replace( 'Adult', 'Guest', $translated_text );

    return $translated_text;
}
add_filter( 'gettext', 'hotelier_custom_adults_text', 10, 3 );

Hi, where should I put this code?

In functions.php of your child theme.

It didn’t work. Additional problem I have is, that page disappeared while logged in to wordpress.com. The case is probably, date picker remembers dates; once date is past, page disappears – to open it I have to move to private mode.

Now I probably entered interdependent problems I can’t solve ??

Just select another date here: https://thimarigardens.com/accommodations/

If dates are invalid, then the session is emptied. This is correct and expected. You can’t make a reservation with the wrong dates.

Regarding the other issue, try to change the code to:

function hotelier_custom_adults_text( $translated_text, $untranslated_text, $domain ) {
	if ( $domain !== 'wp-hotelier' && $domain !== 'wp-hotelier-advanced-pricing-system' ) {
		return $translated_text;
	}

	$translated_text = str_replace( 'Adults', 'Guests', $translated_text );
	$translated_text = str_replace( 'Adult', 'Guest', $translated_text );

    return $translated_text;
}
add_filter( 'gettext', 'hotelier_custom_adults_text', 10, 3 );