added comment section on card details to avoid loading the card comment activities from the server

- and added to show only the activities a card

- to display the card comments a connection to the server was needed to get the activities of the card comments, now, it's not necessary
- also performance relevant. until now there were a lot of activities loaded, now only of the current card

client/components/users/userHeader.jade

@@ -153,12 +153,6 @@ template(name="changeLanguagePopup")
 
 template(name="changeSettingsPopup")
   ul.pop-over-list
-    //li
-    //  a.js-toggle-system-messages
-    //    i.fa.fa-comments-o
-    //    | {{_ 'hide-system-messages'}}
-    //    if hiddenSystemMessages
-    //      i.fa.fa-check
     //li
     //  a.js-toggle-desktop-drag-handles
     //    i.fa.fa-arrows

client/components/users/userHeader.js

@@ -283,16 +283,6 @@ Template.changeLanguagePopup.events({
 });
 
 Template.changeSettingsPopup.helpers({
-  hiddenSystemMessages() {
-    const currentUser = ReactiveCache.getCurrentUser();
-    if (currentUser) {
-      return (currentUser.profile || {}).hasHiddenSystemMessages;
-    } else if (window.localStorage.getItem('hasHiddenSystemMessages')) {
-      return true;
-    } else {
-      return false;
-    }
-  },
   rescueCardDescription() {
     const currentUser = ReactiveCache.getCurrentUser();
     if (currentUser) {
@@ -352,16 +342,6 @@ Template.changeSettingsPopup.events({
       window.localStorage.setItem('showDesktopDragHandles', 'true');
     }
   },
-  'click .js-toggle-system-messages'() {
-    currentUser = Meteor.user();
-    if (currentUser) {
-      Meteor.call('toggleSystemMessages');
-    } else if (window.localStorage.getItem('hasHiddenSystemMessages')) {
-      window.localStorage.removeItem('hasHiddenSystemMessages');
-    } else {
-      window.localStorage.setItem('hasHiddenSystemMessages', 'true');
-    }
-  },
   'click .js-rescue-card-description'() {
     Meteor.call('toggleRescueCardDescription')
     },