Refactor master

CNG: main config.yml (cng db password)
ADD: backend startpage
FIX: save in /app/modules/Core/Db/...
    Manager.php method save
        ( doesnt use ID to create WHERE in update method )
    Entity.php
        ( fix error with 'deleted array key' in save method)
CNG: form_div_layout.html.twig - textarea - add default css class
FIX: Some typos in SettingsForm.php
FIX: AdminController (module Settings and index.twig) - doesnt show notification
     (in form, JetFlashBag)