web: update window title depending on active module

Fixes #4982

UI/PreferencesUI/UIxPreferences.m

@@ -1,6 +1,6 @@
 /* UIxPreferences.m - this file is part of SOGo
  *
- * Copyright (C) 2007-2021 Inverse inc.
+ * Copyright (C) 2007-2022 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
@@ -160,6 +160,11 @@ static NSArray *reminderValues = nil;
   [super dealloc];
 }
 
+- (NSString *) moduleName
+{
+  return [self commonLabelForKey: @"Preferences"];
+}
+
 - (NSString *) modulePath
 {
   return @"Preferences";