Fix typos

[antonkesy]

I went through the code to fix some of the spelling errors. For some words, I created separate commits to make it easier to review them. For these, I mostly used commands like grep -rl 'A' . | xargs sed -i 's/\bA\b/B/g' to mass refactor, but reviewed by hand.

There is still one big commit that changes words that don’t appear often (or don’t affect other files, I hope).

Sorry for the large number of changes. Most of them don’t affect the code. The review should be straightforward :D Mostly scrolling through and double-checking, since there are no functional changes.

If you want me to split it further, remove sections, or anything else, just let me know :D

I hope this is not too a big PR.