basta localizzazioni per ora

Co-authored-by: Copilot <copilot@github.com>

lib/core/widgets/pdf_viewer_widget.dart

@@ -1,5 +1,6 @@
 import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:flux/core/utils/extensions.dart';
 import 'package:flux/core/utils/functions.dart';
 import 'package:pdfx/pdfx.dart';
 import 'package:internet_file/internet_file.dart';
@@ -74,13 +75,13 @@ class _PdfViewerWidgetState extends State<PdfViewerWidget> {
     if (_errorMessage != null) {
       return Scaffold(
         appBar: AppBar(leading: const CloseButton()),
-        body: Center(child: Text("Errore: $_errorMessage")),
+        body: Center(child: Text(context.l10n.commonError(_errorMessage!))),
       );
     }
 
     return Scaffold(
       appBar: AppBar(
-        title: const Text("Anteprima PDF"),
+        title: Text(context.l10n.pdfViewerAnteprimaPdf),
         leading: IconButton(
           icon: const Icon(Icons.close),
           onPressed: () => Navigator.pop(context),