Fix layout of HistoryColorGrid

Use actual color for critical hosts and only display the first two letters of the weekday

library/Icinga/Web/Widget/Chart/HistoryColorGrid.php

@@ -273,7 +273,7 @@ class HistoryColorGrid extends AbstractWidget {
         $sun = DateTimeFactory::create('last Sunday');
         $interval = new DateInterval('P' .  $weekday . 'D');
         $sun->add($interval);
-        return $sun->format('D');
+        return substr($sun->format('D'), 0, 2);
     }
 
     /**

modules/monitoring/application/views/scripts/list/statehistorysummary.phtml

@@ -9,7 +9,7 @@ use Icinga\Data\Filter\Filter;
 <div class="content" data-base-target="_next">
 <?php
 
-$grid->setColor('#FC0707');
+$grid->setColor('#f05060');
 $data = array();
 
 if (count($summary) === 0) {