Hey Mogli,
I only inserted the backslash symbol because otherwise the forums would have printed a real comma in my code examples and that would have defeated my purposes. You can try without the backslash symbol, or with %2C instead.
Alternatively, if you use a spreadsheet editor to modify your CSV file, you can try using normal commas in your sentences, but quote your text cells. In LibreOffice Calc for example, you can check “Edit filter settings” when saving your file and then you will be prompted with an option window where you can check “Quote all text cells.” Maybe that would work.
Jeremy