Update typeface to support Vietnamese language

Feedback
#1

I love using Whimsical and am convincing people to use the product. However, the typeface seems recognizably flawed in Vietnamese. Looks unprofessional when showcased to local stakeholders.

#2

Why @Whimsical doesn’t reply this feedbcak?

#3

@Darta Please check this out

#4

I Agree with @Zydl_Nguyen, The VietNamese font is not good and Whimsical need to improve it.