It's difficult to say where is the problem but according to inspector you have:
<div class="product-prices"> <span id="product-availability" class="badge badge-success product-available"> <i class="fa fa-check rtl-no-flip" aria-hidden="true"></i> Fără stoc </span> </div>
1. It depends on your theme, but check product-prices.tpl in {your_theme}/templates/catalog/_partials/product-prices.tpl
NOTICE: it can include other .tpl files, so track all of them.
2. 100% but long method:
Download all the files of your shop, open files folder with your code editor (ex: Atom or Sublime Text), press Ctrl+Shift+F (find in project) and write your phrase "Fără stoc" and then see the results. In the results, track .tpl files.
If this method doesnt work it seems you have problems with cache. Also you can delete shop.json file from {root_folder}/config/themes/{your_theme}
Hope it helps!
