feat(content_management): add localization support for source types

- Import SourceTypeL10n extension to enable localization of source types

Author: fulleni

lib/content_management/view/edit_source_page.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/content_management/bloc/content_management_bloc.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/content_management/bloc/edit_source/edit_source_bloc.dart';
+import 'package:flutter_news_app_web_dashboard_full_source_code/shared/extensions/source_type_l10n.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/l10n/l10n.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/shared/shared.dart';
 import 'package:go_router/go_router.dart';