chore: Rename variables, cleanup code

lib/features/document_scan/cubit/document_scanner_cubit.dart

@@ -44,14 +44,14 @@ class DocumentScannerCubit extends Cubit<List<File>> {
   Future<void> saveToFile(
     Uint8List bytes,
     String fileName,
-    String preferredLocaleSubtag,
+    String locale,
   ) async {
     var file = await FileService.saveToFile(bytes, fileName);
     _notificationService.notifyFileSaved(
       filename: fileName,
       filePath: file.path,
       finished: true,
-      locale: preferredLocaleSubtag,
+      locale: locale,
     );
   }
 }

lib/features/document_scan/view/scanner_page.dart

@@ -204,9 +204,9 @@ class _ScannerPageState extends State<ScannerPage>
           if (!isGranted) {
             showSnackBar(
               context,
-              "Please grant permissions for Paperless Mobile to access your filesystem.",
+              "Please grant Paperless Mobile permissions to access your filesystem.",
               action: SnackBarActionConfig(
-                label: "GO",
+                label: "OK",
                 onPressed: openAppSettings,
               ),
             );