Fix saving the note of a card

Fixes #3849

UI/WebServerResources/js/Common/ln2br.filter.js

@@ -0,0 +1,21 @@
+/* -*- Mode: javascript; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/**
+ * ln2br - A filter to convert line feeds and carriage returns to html line breaks
+ * @memberof SOGo.Common
+ */
+(function () {
+  'use strict';
+
+  /**
+   * @ngInject
+   */
+  function ln2br() {
+    return function(text) {
+      return text ? String(text).replace(/\r?\n/gm, '<br>') : undefined;
+    };
+  }
+
+  angular.module('SOGo.Common')
+    .filter('ln2br', ln2br);
+})();