A small fix, because I noticed that the HTML on the safemode page doesn't validate.
<pre> aren't allowed inside of
<p> as they are also block elements and therefore are closing the
Not sure why, but the UI result changed: https://builds-artifacts.piwik.org/piwik/piwik/3.x-dev/24976/UIIntegrationTest_fatal_error_safemode.png
Would you update the screenshot? Then it's imho good to merge
Done in f4ec57d2e8ccafee90c0fa8e683e5a3e1cb81054