Fix date formatting for end-date display

app/templates/jobs/job.html.j2

@@ -79,7 +79,7 @@
       if (timestamp === null) {
         end_date = "N.a.";
       } else {
-        end_date = new Date(timestamp * 1000).toLocaleString();
+        end_date = new Date(timestamp * 1000).toLocaleString("en-US");
       }
       document.getElementById("end-date").value = end_date;
       M.updateTextFields();