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In modcp.lang.php line 245

$l['suspend_signature'] = "<strong>Suspend this user's signature</strong>";

remove the strong tags, and if required put

<dt><label><input type="checkbox" name="suspendsignature" value="1" class="checkbox" {$checked_item} onclick="toggleAction();" /> <strong>{$lang->suspend_signature}</strong></label></dt>

in modcp_editprofile_signature template.