Proofread and fixed (special thanks to Kai!)

The game had several grammar and typos that I didn't have time to check before releasing the game. As English is not my first language I intended to check it out later when I had time (and courage :,D) to correct everything. But! Kai proposed to review it for me and gave me an opinion on improvements that could be made (even in the code!) and I was able to fix everything much faster and easier. If there's anything that I missed, please tell me and I'm checking. 

Thanks Kai!