Don't use $txt['by']

Signed-off-by: John Rayes <live627@gmail.com>
$txt['post_by_member']

Signed-off-by: John Rayes <live627@gmail.com>
Restore $txt['by']

Signed-off-by: John Rayes <live627@gmail.com>
oops

Signed-off-by: John Rayes <live627@gmail.com>
Merge pull request #790 from live627/by

$txt['by'] and debugging