Hi,
Could you try to change the code:
$body=str_replace('</head>', '<script type="text/javascript" src="
apis.google.com/js/plusone.js
"></script></head>', $body);
by:
$mainLang = &JFactory::getLanguage();
$tag = $mainLang->get('tag');
if(!in_array($tag,array('zh-CN','zh-TW','en-GB','en-US','pt-BR','pt-PT'))) $tag=strtolower(substr($tag,0,2));
$lang = '{"lang": "'.$tag.'"}';
$body=str_replace('</head>', '<script type="text/javascript" src="
apis.google.com/js/plusone.js
">'.$lang.'</script></head>', $body);
in the file plugins/content/hikashopsocial.php
That should allow google to use the correct language automatically.