teorethically it's possible. You should to create your own "order total" extension, that will have storefront model (you can look into public_html/storefront/model/total/handling.php for example  ).
This model must have method getTotal(). It returns an array that looks like as
$total_data[] = array(
                    'id'         => 'handling',
                    'title'      => $language->get('text_handling'),
                    'text'       => $this->currency->format($conf_hndl_fee),
                    'value'      => $conf_hndl_fee,
                    'sort_order' => $this->config->get('handling_sort_order'),
                    'total_type' => $this->config->get('handling_fee_total_type'),
                );So in your model you can set 'value' key as 0, but 'text' can be any text as you want.
Zero value  does not affect on subtotal and total amount of order.
You can try to change some existing model such as handling.php to check this approach.
If it work - create your own extention with your own custom total model

Hi,
no, the problem was somewhere else.

With PDO enabled there is a problem with character %,  it was fixed with using amysqli connection.

But language xml is still loaded with \%  instead %, so this was parsed: 

Quote

You can view your order details by going to the <a href="\%s">invoice page</a>

can you open phpMyAdmin and check collation of table language_definitions and it's columns?
It must be utf8_general_ci

Refresh didn't help. I had it manually change in language definitions (English).

Please check if mysqli php-extension is enabled. You can find it inside Cpanel. See php-modules.

try to uncheck mysqlnd and check nd_mysqli

Hi.
You should to use hooks of controller account/create.

//before controller run (init) you can check is request POST and do something.
see https://github.com/abantecart/abantecart-src/blob/master/public_html/storefront/controller/pages/account/create.php#L33

Also you can do something after account creation  https://github.com/abantecart/abantecart-src/blob/master/public_html/storefront/controller/pages/account/create.php#L75
with updateData hook

Hi. You doing something wrong.
Check file public_html/core/init.php
You should find     require_once(DIR_CORE.'engine/controller.php'); there.

check if this file loaded

all blurb stored in database as html-entities to prevent injections.
You should to change your tpl (product/product.tpl) and decode entities.
Just find variable $product_info['blurb'] and replace with html_entity_decode($product_info['blurb'], ENT_QUOTES, 'UTF-8');

Your site under SSL (https) but items urls in plain http protocol.
I see redirects in browser devtools. Probably related to this.. not sure