Elle here from Shopify.
Currently, the 'Buy It Now' button language can only be changed if you select a supported language through your theme. These languages have pre-defined translations which will allow the button language to be modified.
Since Romanian is not currently a language supported by Shopify, the Buy It Now button cannot be translated.
I will be sure to submit a feature request on your behalf to have Romanian added as a supported language!
Hi - have you seen this thread about the same thing? https://community.shopify.com/c/Shopify-Discussion/Hot-to-Change-the-name-of-the-quot-BUY-IT-NOW-quo...
Looks like you'll need to add the code in the article (and maybe adjust it for your specific theme) to achieve this.