refactor(content_management): update import statements

- Remove unused import of edit_source_bloc.dart
- Add missing import of source_type_l10n.dart

Author: fulleni

lib/content_management/view/sources_page.dart

@@ -3,10 +3,10 @@ import 'package:data_table_2/data_table_2.dart';
 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/l10n/app_localizations.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/l10n/l10n.dart';
 import 'package:flutter_news_app_web_dashboard_full_source_code/router/routes.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/shared/extensions/content_status_l10n.dart';
 import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';