Fix typos and language issues

[jhrcek]

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Please include the following checklist in your PR:

• Patches conform to the coding conventions.
• Any changes that could be relevant to users have been recorded in the changelog (add file to changelog.d directory).
• The documentation has been updated, if necessary.

Please also shortly describe how you tested your change. Bonus points for added tests!

PS: sorry for triggering the full build matrix, but I also changed some cabal output message which was in some kind of golden test, so I thought it would be better to run the tests.

[phadej]

Thanks