if user doesn't have l1, return system lang (#1230)

lib/pangea/controllers/language_controller.dart

@@ -3,6 +3,7 @@ import 'package:fluffychat/pangea/controllers/language_list_controller.dart';
 import 'package:fluffychat/pangea/controllers/pangea_controller.dart';
 import 'package:fluffychat/pangea/models/language_model.dart';
 import 'package:flutter/material.dart';
+import 'package:universal_io/io.dart';
 
 import '../widgets/user_settings/p_language_dialog.dart';
 
@@ -27,6 +28,11 @@ class LanguageController {
       _userL1Code != LanguageKeys.unknownLanguage &&
       _userL2Code != LanguageKeys.unknownLanguage;
 
+  LanguageModel get systemLanguage {
+    final String systemLang = Platform.localeName.split('-').first;
+    return PangeaLanguage.byLangCode(systemLang);
+  }
+
   String? get _userL1Code {
     final source =
         _pangeaController.userController.profile.userSettings.sourceLanguage;

lib/pangea/widgets/user_settings/p_language_dialog.dart

@@ -23,8 +23,8 @@ Future<void> pLanguageDialog(
   //PTODO: if source language not set by user, default to languge from device settings
   final LanguageModel? userL1 = pangeaController.languageController.userL1;
   final LanguageModel? userL2 = pangeaController.languageController.userL2;
-  final String systemLang = Localizations.localeOf(parentContext).languageCode;
-  final LanguageModel systemLanguage = PangeaLanguage.byLangCode(systemLang);
+  final LanguageModel systemLanguage =
+      pangeaController.languageController.systemLanguage;
 
   LanguageModel selectedSourceLanguage = systemLanguage;
   if (userL1 != null && userL1.langCode != LanguageKeys.unknownLanguage) {