added localization and permission error snackbar

lib/service/notifying.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import '../l10n/app_localizations.dart';
 import 'url_launcher.dart' show UrlLaunchErrorCode;
 
 class Notifying {
@@ -46,10 +47,18 @@ class Notifying {
     if (errorCode == UrlLaunchErrorCode.none) {
       return;
     } else if (errorCode == UrlLaunchErrorCode.couldNotLaunch) {
-      errorText = 'Could not launch Url';
+      errorText = AppLocalizations.of(context)!.errorCouldNotLaunchUrl;
     } else {
-      errorText = 'Invalid Url';
+      errorText = AppLocalizations.of(context)!.errorInvalidUrl;
     }
     showSnackbar(context, text: errorText, isError: true);
   }
+
+  static void showStoragePermissionErrorSnackbar(BuildContext context) {
+    showSnackbar(
+      context,
+      text: AppLocalizations.of(context)!.errorStoragePermisson,
+      isError: true,
+    );
+  }
 }