adjust scrollview layout parameters, to make sure buttonbar is shown
onpreparedialog is not only called, when dialog is called, hence use our own wrapper for showdialog instead
layout adjustments:
1) make alertdialog wider; 2) make green color for income better visible on light theme; 3) make buttons slightly smaller to fit the buttons into HELP dialog
file_encoding preference should depend on perform_share setting
missing translations