refactor: organize sources by language directories

dart/manga/multisrc/madara/src/pt/arthurscan/arthurscan.dart

@@ -0,0 +1,15 @@
+import '../../../../../../../model/source.dart';
+
+Source get arthurscanSource => _arthurscanSource;
+
+Source _arthurscanSource = Source(
+  name: "Arthur Scan",
+  baseUrl: "https://arthurscan.xyz",
+  lang: "pt-BR",
+
+  typeSource: "madara",
+  iconUrl:
+      "https://raw.githubusercontent.com/kodjodevf/mangayomi-extensions/$branchName/dart/manga/multisrc/madara/src/pt/arthurscan/icon.png",
+  dateFormat: "MMMMM dd, yyyy",
+  dateFormatLocale: "pt-br",
+);