Header containing single quote followed by accented character not displayed correctlyin toc

To reproduce:
Set a header tag such as - [header = L'épaule]

When the page is viewed the toc will show L'épaule rather than L'épaule.

The change to the string occurs at line 656 in pagination.module:
'data' => ($this->getPageVar() == $key) ? check_plain($header) : l($header, $_GET['q'], $options),

The check_plain() call results in the erroneous behaviour but I'm not clear on how the problem should be patched.