Fix issues raised by code review

Remove explicit `self.` from #process of parsers

Remove explicit return tuple in get_issue_template

Fix formatting

Move inline issue template style to stylesheet

Use @id in ProblematicTimelineItem xml repr

Fix naming

assets/css/default.css

@@ -880,4 +880,9 @@ h1, h2, h3, h4, h5, p,
 
 .error-card pre {
   height: 300px;
+}
+
+.error-issue-template {
+  padding: 20px;
+  background: rgba(0, 0, 0, 0.12345);
 }