adding delete words option to security Preferences

src/js/controllers/preferencesDeleteWords.js

@@ -0,0 +1,23 @@
+'use strict';
+
+angular.module('copayApp.controllers').controller('preferencesDeleteWordsController',
+  function($scope, $rootScope, $filter, $timeout, $modal, $log, confirmDialog, storageService, notification, profileService, isCordova, go, gettext, gettextCatalog, animationService) {
+    var self = this;
+    var fc = profileService.focusedClient;
+    var msg = gettext('Are you sure you want to delete the backup words?');
+    var successMsg = gettext('Backup words deleted');
+
+    self.delete = function() {
+      confirmDialog.show(msg,
+        function(ok) {
+          if (ok) {
+            fc.clearMnemonic();
+            profileService.updateCredentialsFC(function() {
+              notification.success(successMsg);
+              go.walletHome();
+            });
+          }
+        });
+    };
+
+  });

src/js/controllers/securityPreferences.js

@@ -0,0 +1,12 @@
+'use strict';
+
+angular.module('copayApp.controllers').controller('securityPreferencesController',
+  function($scope, profileService) {
+    var self = this;
+    var fc = profileService.focusedClient;
+    self.deleted = false;
+    if (fc.credentials && !fc.credentials.mnemonicEncrypted && !fc.credentials.mnemonic) {
+      self.deleted = true;
+    }
+
+  });