`label` field of suggestions is also HTML escaped

Without this if the suggestion text contains a double quote, the
response stops being a valid json.

static/templates/head_part.html

@@ -18,6 +18,7 @@
 
   response: function( event, ui ) {
         for(const item of ui.content) {
+            item.label = htmlDecode(item.label);
             item.value = htmlDecode(item.value);
         }
   },

static/templates/suggestion.json

@@ -2,6 +2,6 @@
   {{#suggestions}}{{^first}},{{/first}}
   {
     "value" : "{{value}}",
-    "label" : "{{& label}}"
+    "label" : "{{label}}"
   }{{/suggestions}}
 ]