Initilize content classes and translations
Display newsletter_collection content class in tree menu
Add newsletter top menu
Fix class name
First part of page newsletter/index
Finalize index page
Left menu for newsletter navigation part
OWNewsletterSubscription::add persistent object
Get subscriptions count by status
Rename navigation part
Mailing list children
Change Subscribtion by Subscriber
Clean up OWNewsletterSubscription class
Add fetch function
Change fetch methods calls
Remove field from database
New "user" management function
Remove constructor
Cleanup OWNewsletterUser class
Add new classes