[Resolved] theme functions string variable translation

Background of the issue:
I am trying to use a variable within functions.php in a custom shortcode for my WordPress site hidden link. The text is not a simple string; it is a variable. Here is the code I am working with:

add_shortcode( 'bw-shipping-difference', 'bw_get_shipping_difference' );
function bw_get_shipping_difference( $atts ) {
if ( ! WC()->cart ) {
return 'N/A';
}

$min_amount = 399; // YOUR FREE SHIPPING THRESHOLD

// if cart is empty, return nothing
if ( WC()->cart->is_empty()) {
return 'Free delivery on orders of ' . wc_price( $min_amount ) . ' or more.';
}

$current = WC()->cart->subtotal;

if ( $current < $min_amount ) {
$added_text = 'Only ' . wc_price( $min_amount - $current ) . ' away from free shipping!';
} else {
$added_text = 'Congratulations! Shipping is on us :)';
}

return $added_text;
}

Symptoms:
The text within the variable is not being recognized by WPML for translation.

Questions:
How must the code be updated to allow WPML to see the strings and translate them?