Add ability to make multilanguage support for hints

[Kol9yN]

Many users who begin to learn HTML\CSS not good with English in some cases, would be good to see hints on native language, and not spend time to translate errors on alien lang... :)

[coliff]

Good suggestion! I think this would be better handled by the main HTMLHint code rather than just the VS Code extension so I'll migrate this issue over there.