chore: add 'language' field to user.dart

packages/stream_chat/lib/src/core/models/user.dart

@@ -18,6 +18,7 @@ class User extends Equatable {
     this.extraData = const {},
     this.banned = false,
     this.teams = const [],
+    this.language = 'en',
   })  : createdAt = createdAt ?? DateTime.now(),
         updatedAt = updatedAt ?? DateTime.now();
 
@@ -82,6 +83,13 @@ class User extends Equatable {
   )
   final Map<String, Object?> extraData;
 
+  /// The language this user prefers.
+  ///
+  /// Defaults to 'en'.
+  @JsonKey(
+      includeIfNull: false, toJson: Serializer.readOnly, defaultValue: 'en')
+  final String? language;
+
   @override
   int get hashCode => id.hashCode;
 

packages/stream_chat/lib/src/core/models/user.g.dart

@@ -25,6 +25,7 @@ User _$UserFromJson(Map<String, dynamic> json) {
     teams:
         (json['teams'] as List<dynamic>?)?.map((e) => e as String).toList() ??
             [],
+    language: json['language'] as String? ?? 'en',
   );
 }
 
@@ -47,5 +48,6 @@ Map<String, dynamic> _$UserToJson(User instance) {
   writeNotNull('online', readonly(instance.online));
   writeNotNull('banned', readonly(instance.banned));
   val['extra_data'] = instance.extraData;
+  writeNotNull('language', readonly(instance.language));
   return val;
 }