I've went through every Scenario description visible in the "New Game" dialogue - This includes Tutorials, Standalone Scenarios and all DLC up to and including Fail Safe. It does not include the community scenario pack.
I haven't went through subsequent briefing screens for any scenario - I may do this in future; but wouldn't hold your breath.
I've uploaded all corrections (~110 files) into a zip file here (due to the 10MB limit on attachments here). Just copy the "Scenarios", "Lua" and "QuickBattle" folders from the zip file below into your base CMO game folder.
Download V2 from Dropbox
To be clear: All credit lies with the original scenario authors for the significant effort they've put into their scenarios and descriptions - I just wanted to improve the polish and am not seeking any benefit from this. I am happy for these corrections to be included in a future game update without any expectation for credit, recognition etc.
Enjoy

Edit: 3rd April 2025 - Release of V2 above - Updated all accessible briefings as well as scenario descriptions to remove spelling errors. Corrected spelling issues on QuickBattle configurations (temparature -> temperature and seperation -> separation).
Edit: 17th July 2025 - Updated for the scenarios included in Beta build 1706