Hotkeys in dialogs. Step 4. Final

- All dialogs, which I have been able to bring to screen, are marked with hotkeys
- Colors for dialog hotkeys in default scheme are set to red

Development phase on the hotkeys is finished. Complains are welcome.

Minor changes:
- Fixed language in messages
- dbg_printf() now works in Windows by showing messages in  Windows debug output
- Added copmments on my understanding of color skins API in color-style.cpp

All runs fine on Windows, and Linux.