Remove i18n package. Add xml files with strings to flutter assets. Create method for passing localized strings to channel.

lib/common.dart

@@ -5,7 +5,6 @@ import 'package:checker/screens/splash.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:image_picker/image_picker.dart';
-import 'package:intl/intl.dart';
 
 import 'db.dart';
 import 'dart:convert';
@@ -46,9 +45,8 @@ logout(BuildContext context, SqliteHelper helper) async {
         helper.clear().then((result) {
 //          helper.close().then((_) {
 //          Navigator.of(context).pop();
-//          Navigator.of(context).pop();
-          pushRouteReplacement(
-              context, new SplashScreen()); // Запускаем регистрацию
+          Navigator.of(context).pop();
+          pushRouteReplacement(context, new SplashScreen()); // Запускаем регистрацию
 //          });
         });
       }).catchError((error) {
@@ -162,13 +160,16 @@ startScanner(BuildContext context, String app, SqliteHelper helper) async {
         }
       });
 
-      platform.invokeMethod('startScanner', {
+      Map<String, String> args = StringsLocalization.strings;
+      args.addAll({
         'token': token,
         'url': await platform.invokeMethod('getEndpoint'),
         'appToken': await platform.invokeMethod('getAppToken'),
-        'locale': Intl.defaultLocale,
-        'color': Resources.getPrimaryColor(app).value
+        'locale': StringsLocalization.localeCode,
+        'color': Resources.getPrimaryColor(app).value.toString()
       });
+
+      platform.invokeMethod('startScanner', args);
     }
   }
 }