I renamed the original title of this thread to match the first question you asked. Previously the title had nothing to do with your questions.
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Please read this article: Rendering Facebook Connect in Other Languages - Facebook Developers
You should change line 1 of /modules/fb/templates/fb_script.tpl to suit the appropriate language. Below is an example to use the Spanish language from Latin America.
Code:
<script type="text/javascript" src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/es_LA"></script>
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To change the button language, you should edit /modules/fb/templates/fb_login.php.
Change line 9:
Code:
<fb:intl>Connect with Facebook</fb:intl>
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Buying the module only covers 1 website. You will need to buy a second license to operate the module on a second site.