Welcome to the forum UltraM
you must set the VC speech language to English if you are going to use English commands. In your first post you show the history window and it says it is using the German engine. Then you are saying English commands like "ignore me", "go home". It is understanding you but it is not confident enough.
When you get the ? icon in the history window, it is because the confidence is too low. The % next to the question mark is the confidence and it must be higher than the required confidence that you set in Options. If the confidence is high enough you will get the megaphone icon instead of the ? icon.
If you only have German installed on your version of windows then you should use German phrases in your commands. In this case, you should get a German configuration from Kalle, or you should edit the tree and replace the phrases with German.
If you want to install English on your windows it is possible.
Once you get the megaphone, the commands should work. If you get megaphones and nothing is happening, then we need to look at your settings for xbmc, but at least the basic commands like "pay attention" and "ignore me" should always work!