Jobset job tab: Show eval date rather than eval ID

Eval IDs carry no useful information, so it's better to show the date
of the eval. If the date is recent, a relative date is given (e.g. "3h
ago").

src/root/static/css/rotated-th.css

@@ -9,7 +9,7 @@ td.centered {
     text-align: center;
 }
 
-.table-header-rotated th.rotate-45{
+.table-header-rotated th.rotate-45 {
     height: 80px;
     width: 40px;
     min-width: 40px;