Use the Unicode converter addon to convert Unicode characters to a format that Scrapebox can use.
www.scrapestuff.com/scrapebox-unicode-converter-allows-scraping-of-unicode-keywords-in-scrapebox
By default scrapebox does not support Unicode characters, but with this addon you can scrape unicode characters. You can get to the addon direction from the keyword scraper import menu as well.
Note: If you want to post comments with unicode characters, you can do that with the learning mode addon.
The unicode converter uses encoding to make the keywords compatible, so you will naturally see unreadable content. However if you were to just paste keywords in you would see all question marks.