few fixes and main menu reorganisation

* Fixed handling of multi-page content.
    * issue: both channels content browsing and search result with at max 24 items to display.
* Added setting for preferred content language. 
    * instead having to choose language at main menu there is setting added for it.
* Main menu reorganized.
    * main menu with featured, channels and search. 
    * also channels and search dir removed from browse method.