Add these snippets to your child theme’s functions.php file or use a plugin like Code snippets. Don’t add code directly to the parent theme’s functions.php file as it will be overridden by updates. Customize the texts/values in pink to whatever you need.

add_filter( 'easy_booking_start_text', 'wceb_custom_start_text', 10, 2 );

function wceb_custom_start_text( $text, $product = false ) {

    // You have access to the $product variable (not everywhere) in case you want to display a different text for some products
    $text = __( 'Your custom text', 'woocommerce-easy-booking-system' ); // Translation-ready
    return $text;

}
add_filter( 'easy_booking_end_text', 'wceb_custom_end_text', 10, 2 );

function wceb_custom_end_text( $text, $product = false ) {

    // You have access to the $product variable (not everywhere) in case you want to display a different text for some products
    $text = __( 'Your custom text', 'woocommerce-easy-booking-system' ); // Translation-ready
    return $text;

}
add_filter( 'easy_booking_get_price_suffix', 'easy_booking_custom_price_suffix', 10, 3 );

function easy_booking_custom_price_suffix( $suffix, $_product, $booking_duration ) {
    $suffix = 'your custom text';
    return $suffix;
}
add_filter( 'easy_booking_price_html', 'easy_booking_display_custom_price', 10, 3 );

function easy_booking_display_custom_price( $price_html, $product, $price ) {
    $content = 'From ' . $price_html;
    return $content;
}
add_filter( 'easy_booking_price_html', 'easy_booking_display_custom_price', 10, 3 );

function easy_booking_display_custom_price( $price_html, $product, $price ) {
    $price_html .= ' your custom text';
    return $price_html;
}
add_filter( 'easy_booking_select_dates_text', 'easy_booking_custom_select_dates_text', 10, 2 );

function easy_booking_custom_select_dates_text( $text, $product ) {
    $text = __( 'Your custom text', 'woocommerce-easy-booking-system' );
    return $text;
}
add_filter( 'easy_booking_total_booking_duration_text', 'wceb_custom_total_booking_duration_text', 10, 3 );

function wceb_custom_total_booking_duration_text( $text, $duration, $unit ) {

    // $duration is the selected duration and $unit "days" or "nights"
    $text = __( 'Your custom text' );
    return $text;

}
add_filter( 'easy_booking_average_price_text', 'wceb_custom_average_price_text', 10, 3 );

function wceb_custom_average_price_text( $text, $product, $average_price ) {

    $text = __( 'Your custom text' );
    return $text;

}
add_filter( 'easy_booking_display_average_price', '__return_false' );
add_filter( 'easy_booking_product_first_available_date', 'wceb_set_date_to_next_day', 10, 2 );

function wceb_set_date_to_next_day( $first_available_date, $product ) {

    date_default_timezone_set( 'Europe/Paris' );

    $time    = date( 'H:i:s', strtotime( '12:00:00' ) );
    $timenow = date( 'H:i:s', strtotime( 'now' ) );

    if ( $timenow > $time ) {
        $first_available_date += 1;
    }

    return $first_available_date;

}