hi,
For the "More Info" text; the PNG is this:
/templates/YOUR_TEMPLATE/html/com_virtuemart/assets/images/Flexible/productdetails.png
You can open the PSD (photoshop source-file) change the text and save it as PNG. The PSD can be found in here:
/templates/YOUR_TEMPLATE/html/com_virtuemart/assets/images/Flexible/productdetails.psd
Same idea is valid for the "Next" - "Prev" text in the product details page. The PNG and PSD files are as follow:
/templates/YOUR_TEMPLATE/html/com_virtuemart/assets/images/Flexible/next_prev.png
/templates/YOUR_TEMPLATE/html/com_virtuemart/assets/images/Flexible/next_prev.psd
Regards,
Support