Paste your list, pick how to sort it and copy the result. Your text never leaves this computer.
Yes. Sorting follows the alphabet of the page language, so on the Turkish page ç, ğ, ı, ö, ş and ü go to their proper places.
Natural sorting puts 2 before 10. The By number option uses the first number in each line, and lines without a number go to the end.
By default it is ignored. Turn that option off to take letter case into account.