I think related to this fixing: http://www.phpbb.com/bugs/viewreport.php?b=6280" target="_blank
ACP -> System -> Language packs
In Firefox2 the lines are being fitted to the width of the browser.
In IE7 the lines are as long as the text (I think the 270 letters though), not fitting the browser. Of course it is a bit better to edit the text if not being fitted, but it looks a bit strange and is not so easy to handle I think.