Fix english

I've added corrections to grammar and capitalisation for the English version. This includes rephrasing of a few sentences for clarity, changing the quotation mark style to that which is traditional on American/British English keyboards, changing a few hyphenated words to just having a space, as well as a substantial amount of removal of capitalisation with regard to proper nouns vs common nouns.

I hope I haven't missed anything, I had to lower-case a lot of words and might have made a few so incorrectly, but the running theme is that you only capitalise the start of sentences/phrases and proper nouns, not common nouns. If you have any queries over this then feel free to contact me or debate over any of it.