Added new query options for tags, added pdf preview on documents scanner page

lib/features/documents/view/widgets/selection/confirm_delete_saved_view_dialog.dart

@@ -18,10 +18,10 @@ class ConfirmDeleteSavedViewDialog extends StatelessWidget {
   Widget build(BuildContext context) {
     return AlertDialog(
       title: Text(
-        "Delete view " + view.name + "?",
+        S.of(context).deleteViewDialogTitleText + view.name + "?",
         softWrap: true,
       ),
-      content: Text("Do you really want to delete this view?"),
+      content: Text(S.of(context).deleteViewDialogContentText),
       actions: [
         TextButton(
           child: Text(S.of(context).genericActionCancelLabel),

lib/features/documents/view/widgets/selection/documents_page_app_bar.dart

@@ -77,7 +77,7 @@ class _DocumentsPageAppBarState extends State<DocumentsPageAppBar> {
   Widget _buildFlexibleArea(bool enabled) {
     return FlexibleSpaceBar(
       background: Padding(
-        padding: EdgeInsets.all(8.0),
+        padding: const EdgeInsets.all(8.0),
         child: Column(
           mainAxisAlignment: MainAxisAlignment.end,
           children: [