Add vi locale

[thanhncph05302]

Is your feature request related to a problem? Please describe.

• Not related to the incident
  A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
• I want Jiffy library to support Vietnam country so we can use it for applications in Vietnam country
  Describe the solution you'd like
• I want Jiffy library to support Vietnam country so we can use it for applications in Vietnam country
  A clear and concise description of what you want to happen.
• I want Jiffy library to support Vietnam country so we can use it for applications in Vietnam country
  Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

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Thank you so much!