Hi,
to translate the "Be the first one to review" text, open this INI file:
/administrator/language/en-GB/en-GB.plg_flexibleTemplate.ini
and translate it.
You can't translate the "Facebook" Like text, because it is an iframe comes from Facebook.
You should apply Facebook SDK localization.
Open this PHP file:
/templates/YOUR_TEMPLATE./html/com_virtuemart/productdetails/defualt.php
and find this line:
<s-cript>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=115329165206253";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</s-cript>
pay attention to this line:
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=115329165206253";
replace it with this:
js.src = "//connect.facebook.net/es_ES/all.js#xfbml=1&appId=115329165206253";
(for spanish)
For more info:
developers.facebook.com/docs/javascript/quickstart/v2.1#advancedsetup
regards.