add option to get asked whether unsaved card descriptions should be saved to db on e.g. unintentional click out of card details pane

client/components/users/userHeader.jade

@@ -180,6 +180,13 @@ template(name="changeSettingsPopup")
               option(selected="true", value="#{day.value}") #{day.name}
             else
               option(value="#{day.value}") #{day.name}
+        label.bold.clear
+          {{_ 'card-settings'}}
+        ul#cards.card-description-rescued
+          a.flex.js-rescue-card-description(title="{{_ 'rescue-card-description'}}")
+            b  
+            #rescue-card-description.materialCheckBox.left(class="{{#if rescueCardDescription}}is-checked{{/if}}", value=rescueCardDescription)
+            span {{_ 'rescue-card-description'}}
         input.js-apply-user-settings.left(type="submit" value="{{_ 'apply'}}")
 
 template(name="userDeletePopup")

client/components/users/userHeader.js

@@ -297,6 +297,16 @@ Template.changeSettingsPopup.helpers({
       return false;
     }
   },
+  rescueCardDescription() {
+    currentUser = Meteor.user();
+    if (currentUser) {
+      return (currentUser.profile || {}).rescueCardDescription;
+    } else if (window.localStorage.getItem('rescueCardDescription')) {
+      return true;
+    } else {
+      return false;
+    }
+  },
   showCardsCountAt() {
     currentUser = Meteor.user();
     if (currentUser) {
@@ -356,6 +366,9 @@ Template.changeSettingsPopup.events({
       window.localStorage.setItem('hasHiddenSystemMessages', 'true');
     }
   },
+  'click .js-rescue-card-description'() {
+    Meteor.call('toggleRescueCardDescription')
+    },
   'click .js-apply-user-settings'(event, templateInstance) {
     event.preventDefault();
     let minLimit = parseInt(