Hi,
No, but that's a good idea.
Add the code:
$paymentOptions->payment_params->return_url = hikashop_translate($paymentOptions->payment_params->return_url);
before the line:
foreach(get_object_vars($order) as $key => $val) {
in the file administrator/components/com_hikashop/classes/cart.php
We'll add that change on our end too for the next version of HikaShop, that way, you won't have to do anything when you update.
Then, instead of entering a URL in that "return URL" parameter, you can enter a translation key (for example MY_RETURN_URL).
And then, in the Languages tab of the HikaShop configuration, for each language, you can add such translation override:
MY_RETURN_URL="xxx"
where xxx is the URL you want for the language.