Vietnamese characters, .cleanDiacritics
- don't convert characters:
ậ,ạ,ấ,ậ,ủ,ứ,ờ,ủ, ... - convert characters:
ì,â,ò,ú,ì,á,ó,ô,à,è, ...
I will implement .cleanDiacritics for Vietnamese soon
Vietnamese characters table: https://en.wikipedia.org/wiki/Vietnamese_Standard_Code_for_Information_Interchange