Hello Olga,
There is another issue have the same problem, the word “PROCEED” in the checkout page https://ellithy.34ml.com/checkout/
We found it in loco translate under woocommerce plugin (not exist in the theme or xstore core plugin) and added its translation, but it not appears in front-end, please check these screens:
* https://snipboard.io/hbu21N.jpg
* https://snipboard.io/VeQPgs.jpg
Thank You!