Minor string changes

lib/ui/backup_folder_selection_page.dart

@@ -50,7 +50,7 @@ class _BackupFolderSelectionPageState extends State<BackupFolderSelectionPage> {
               child: Material(
                 type: MaterialType.transparency,
                 child: SectionTitle(
-                  "select folders to preserve",
+                  "preserve memories",
                   alignment: Alignment.center,
                 ),
               ),

lib/ui/backup_folder_selection_widget.dart

@@ -50,7 +50,7 @@ class _BackupFolderSelectionWidgetState
             padding: EdgeInsets.all(4),
           ),
           Text(
-            "select folders to preserve",
+            "backed up folders",
             style: TextStyle(fontSize: 20),
           ),
           Padding(

lib/ui/home_widget.dart

@@ -331,7 +331,7 @@ class _HomeWidgetState extends State<HomeWidget> {
                 height: 80,
                 padding: const EdgeInsets.fromLTRB(80, 0, 80, 0),
                 child: button(
-                  "select folders\nto preserve",
+                  "preserve memories",
                   fontSize: 16,
                   onPressed: () async {
                     routeToPage(context, BackupFolderSelectionPage());