Merci, Michel! That is incredible… very thoughtful and really amazing.

PDF files are not really editable, so they would need to be converted into a format that is editable. You could use something like PDF2DTP https://markzware.com/products/pdf2dtp/ or PDF2ID from Recosoft.

There are many methods for translating InDesign documents. One company I know of that does this is here: https://redokun.com

Oh, one more idea… this script is the only thing I remember from the CS6 days that would also add highlighting:

Style Highlighting

It’s a little confusing… you’re trying to get rid of the brackets and the author, year, and title? So you just have the number left?
And you also want commas between the numbers? Can you provide a more clear example of what you’re starting with and what you want to end with.

Weird! Might be just a single character at the end. Select the story and open Edit > Edit in Story Editor to see if there’s something hiding in there? And turn on Type > Show Hidden Characters.

Yes, it is kind of confusing… You click the Filter button in the lower-right corner (looks like a funnel) and click the Resolved button. That shows you all the comments that have been resolved.