compose and feed: Improve label for DMs to yourself.

web/tests/compose_closed_ui.test.cjs

@@ -222,7 +222,7 @@ run_test("test_non_message_list_input", () => {
         user_ids: [current_user.user_id],
     });
     let label = $("#left_bar_compose_reply_button_big").html();
-    assert.equal(label, "Message yourself");
+    assert.equal(label, "Write yourself a note");
 
     // Invalid data for a the reply button text.
     compose_closed_ui.update_recipient_text_for_reply_button({

web/tests/message_view.test.cjs

@@ -472,7 +472,7 @@ run_test("show_empty_narrow_message", ({mock_template, override}) => {
     assert.equal(
         $(".empty_feed_notice_main").html(),
         empty_narrow_html(
-            "translated: You have not sent any direct messages to yourself yet!",
+            "translated: You haven't sent yourself any notes yet!",
             "translated HTML: Use this space for personal notes, or to test out Zulip features.",
         ),
     );