web: update window title depending on active module

Fixes #4982

UI/Scheduler/UIxCalMainView.m

@@ -1,6 +1,6 @@
 /* UIxCalMainView.m - this file is part of SOGo
  *
- * Copyright (C) 2006-2019 Inverse inc.
+ * Copyright (C) 2006-2022 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -39,6 +39,12 @@
 
 @implementation UIxCalMainView
 
+
+- (NSString *) moduleName
+{
+  return [self commonLabelForKey: @"Calendar"];
+}
+
 - (NSString *) modulePath
 {
   return @"Calendar";