Fix spelling errors on all pages

[mcb2003]

There is absolutely stacks of spelling mistakes on pretty much every single page. This needs to be fixed.

[mcb2003]

I’m pretty sure this has been fixed now.

[mcb2003]

Now that I’ve redone the site, there are more spellings to fix, namely those in the database. Someone with access to the database will have to fix that, so probably me.