Bug 1568306 - Update about:logins dialog strings to match the spec r=fluent-reviewers,jaws,Pike

Differential Revision: https://phabricator.services.mozilla.com/D39104

--HG--
extra : moz-landing-system : lando

browser/components/aboutlogins/content/aboutLogins.ftl

@@ -76,9 +76,9 @@ master-password-reload-button =
   .label = Log in
   .accesskey = L
 
-confirm-delete-dialog-title = Confirm Deletion
-confirm-delete-dialog-message = Are you sure you want to delete this login?
+confirm-delete-dialog-title = Delete this login?
+confirm-delete-dialog-message = This action cannot be undone.
 confirm-delete-dialog-dismiss-button =
   .title = Cancel
 confirm-delete-dialog-cancel-button = Cancel
-confirm-delete-dialog-confirm-button = Delete login
+confirm-delete-dialog-confirm-button = Delete

browser/components/aboutlogins/tests/browser/browser_confirmDeleteDialog.js

@@ -29,12 +29,12 @@ add_task(async function test() {
 
     is(
       title.textContent,
-      "Confirm Deletion",
+      "Delete this login?",
       "Title contents should match l10n attribute set on outer element"
     );
     is(
       message.textContent,
-      "Are you sure you want to delete this login?",
+      "This action cannot be undone.",
       "Message contents should match l10n attribute set on outer element"
     );
     is(
@@ -44,7 +44,7 @@ add_task(async function test() {
     );
     is(
       confirmDeleteButton.textContent,
-      "Delete login",
+      "Delete",
       "Delete button contents should match l10n attribute set on outer element"
     );