Hi
I think facebook script can recognize the site language tag if You use a default language library in settings. But You may also try editing /layout/blocks/social.php and look for facebook button code. There You will see a code like this:
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<?php echo $this->getParam('fb_lang', 'en_US'); ?>
try replace it with:
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<?php echo str_replace('-','_',$this->API->language); ?>
Please try if it works. This may need some adjustment, because I'm not sure if facebook can load case insensitive file names.