Capitalization, grammar, and pluralization fixes. [CI skip]

Just a few fixes to improve consistency and readability. I also want to point out that 'lock' under 'Available Settings' (line 2048) is difficult to understand and should probably be reworded. I was unable to understand the author's intention, or I would have done it myself.
Merge pull request #818 from fluxusfrequency/patch-1

Capitalization, grammar, and pluralization fixes. [ci skip]