KS-4692: [Wiki] Impossible to attach a file having apostrophe in its name

Fix description: Encoding the image's name as following:
* The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same.
* The special characters ".", "-", "*", and "_" remain the same.
* The space character " " is converted into a plus sign "+".
* All other characters are unsafe and are first converted into one or more bytes using some encoding scheme. Then each byte is represented by the 3-character string "%xy", where xy is the two-digit hexadecimal representation of the byte. The recommended encoding scheme to use is UTF-8.