Solving some issues after merging flexible_menu (#948)

* Correct definition of btrfs standard layout

* Solve issue #936

* make ask_for_a_timezone as synonym to ask_timezone

* first batch of changes due to the last merges
selector.text is a call to selector.menu_text
A number of Generalmenu methods reappeared in their old version at Global

* disk encryption password menu option restored

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