cpp-builder: Focus the example on DevExpress Reports localization

- Add an empty example report to ensure both dialogs can load.
- Switch languages using TcxRadioButtons.
  TcxRadioButtons better represent application state than simple buttons.
- Use the German localization language when application starts.
  Check the "German" radiobutton to reflect the default localization.
- Group "Display Report" buttons into a labeled group, change captions.
  Move focus to "Display Report Designer" button when application starts.
- Forbid to resize the application form.
- Give the application a relevant title.
- Use a DevExpress application icon.
- Remove the Data Grid table.
  In this example, data structure is not in the focus of demonstration.
  Data Grid table draws attention from the localization examples.
- Rename several interface components and code members according to
  DevExpress style.
- Comment significant actions in the code example.

Signed-off-by: Nick Volynkin <nikolay.volynkin@devexpress.com>
Co-authored-by: Vladimir Abadzhev <vladimira@devexpress.com>

Author: NickVolynkin