More English and more Go stones!

Sometimes if you fix one bug, a new one emerges...

That happened to me: after fixing a few wrong words in the German translation, the English version suddenly had a few German lines. This is now fixed.

Moreover, an update of Ren'Py broke the mouse cursor changes. I didn't notice that, but now you will see a Go stone again when you are supposed to put one on a board, for instance.

I have also made minor improvements to the English translation.

Hope you'll enjoy the update!