Direct Checkout – Replace Add to cart text together with learnpress

Hello together,

I purchased the Direct Checkout Plugin speed up the checkout process and also rename the buttons for the add to cart (see link). In my setup I use Lernpress and the Lernpress 2 woocommerce extension to purchase the courses over woocommerce. I thought that the Add to Cart button on the learnpress course detail page could be also changed by the Direct Checkout Plugin.

So I adapted in WooCommerce > Direct Checkout > Archives >
* Replace Add to cart text = YES
* Replace Add to cart text in = Selected all product types
* Replace Add to cart text content = Get it now

but somehow its not working. So short questions:
a) is the plugin working also together with the lernpress plugin and the button there ?
b) Any hint how I could solve the issue (I would like to have different button texts for the add to cart button for english and russian).

Thanks for any help or push in the right direction.
Michael

The page I need help with: [log in to see the link]