1) Very good that you like to use Game Editor in English, as English is the only language it's available in.
2) Incase you're referring to the script editor: You can click together some neat little games, but for the advanced use of Game Editor, the script Editor is essential.
3) Game Editor is designed to develop games, yes. You can also make similar (mathematical for instance) projects with it, but it's generally not to be used for database software, hacking etc.
4) The new version will have lots of advantages. I can only name a few, such as the online feature, a new interface, lots of bugs will be fixed, more functions will be added. More information can be found
here.