[Resolved] Help with string translation (woocommerce advanced fields plugin)

Tell us what you are trying to do? Replace text in pricing summary box of Woocommerce Advanced Product Fields plugin and translate the new words in WPML. According to developer of the WAPF plugin WPML should pick up the new words in string translation but it does not.
The below code snippet is added via a plugin.
When I search in string translation it only finds the actual code snippet.
Please advise what needs to get fixed in order to make the new text translatable.

add_filter('wapf/html/product_totals', 'wapf_change_totals_text', 10, 2);
function wapf_change_totals_text($html, $product) {
return str_replace(
array(__('Product total','sw-wapf'), __('Options total','sw-wapf'), __('Grand total','sw-wapf')),
array(__('Product subtotal','sw-wapf'), __('Additional options total','sw-wapf'), __('Product total, plus shipping','sw-wapf')),
$html
);
}

Is there any documentation that you are following? hidden link

Is there a similar example that we can see? hidden link

What is the link to your site? see above.