file: wp-includes/template-functions-comment.php
line: 160
in the function comment_type() the words “comment”, “track-back” and “ping-back” are echoed. So if you put the tranlation-function _e() around the text you get the right tranlated text at “Comment by…” Here is a snippet of it with the three minor changes at the “echo”s:
function comment_type($commenttxt = 'Comment', $trackbacktxt
= 'Trackback',
$pi
global $comment;
if (preg_match('|<trackback />|', $comment->comment_content))
echo _e($trackbacktxt);
elseif (preg_match('|<pingback />|', $comment->comment_content))
echo _e($pingbacktxt);
else
echo _e($commenttxt);
}
Best regards
Otti