Fix asynchronous calls with resetSettings

The `resetSettings` function now returns the ajax object, allowing to
chain other calls to it, e.g. the `getHistory` function.

kfet/templates/kfet/kpsul.html

@@ -182,7 +182,7 @@ $(document).ready(function() {
     settings = {}
 
     function resetSettings() {
-        $.ajax({
+        return $.ajax({
             dataType: "json",
             url     : "{% url 'kfet.kpsul.get_settings' %}",
             method  : "POST",
@@ -1431,9 +1431,10 @@ $(document).ready(function() {
         resetArticles();
         resetPreviousOp();
         khistory.reset();
-        resetSettings();
-        getArticles();
-        getHistory();
+        resetSettings().done(function (){
+            getArticles();
+            getHistory();
+        });
     }
 
     function resetSelectable() {