Cleans any characters in string that are not in either the Latin unicode range or in the Arabic alphabet
A string from which characters which are not Latin or Arabic should be removed.
cleanChars returns a string with only Latin and Arabic characters.
## Create string with Arabic, latin, and Hebrew characters
x <- '\u0627\u0647\u0644\u0627 \u0648\u0633\u0647\u0644\u0627 Hello \u05d0'
## Remove characters from string that are not Arabic or latin