@nacin, in http://core.trac.wordpress.org/browser/trunk/wp-includes/class-wp-customize.php#L640, I see a 

<label>%s %s</label>

string for translation, but can’t figure out why a) the html tags are in there (some people *will* translate them and break it) and b) the two %s. Either a comment is needed or that line is wrong.