[Findit] Add feedback button for manual triage.

appengine/findit/static/common.css

 body {
   padding: 5px;
 }
 
 table {
   border-collapse: collapse;
   border: 1px solid gray;
 }
 
 table td, table th {
   padding: 5px;
   border: 1px solid gray;
 }
+
+.triage-area {
+  border-radius: 7px;
+  display: inline-block;
+}
+
+.triage, .triaged {
+  display: block;
+  float: left;
+  vertical-align: middle;
+}
+
+.triage {
+  background-color: #e5e5e5;
+  cursor: pointer;
+}
+
+.triaged {
+  cursor: default;
+}
+
+.not-display, .hidden-row {
+  display: none;
+}