You're about 2 hours too late. I discovered that myself, as you can see in my code. I had to do that today, so thought I would post it to give him an idea.
Nancy
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
From: Shai Gluskin
See my full response at:
http://lists.drupal.org/pipermail/support/2011-April/017477.html
With string overrides, the problem is that there may be markup, or even replacement tokens inside the t() function. For the replacement to work, you need get the whole contents of the existing text in the t(), which often means finding it in the code.
In this case, what is in the t() function is:
Read more<span class="element-invisible"