feat: add Vietnamese language support

[huyvt-2722]

Description:

In our edx-plasform app, we need VIetnamese support language (in MFE). So this PR will add vi locate into i18n

Merge checklist:

• Consider running your code modifications in the included example app within frontend-platform. This can be done by running npm start and opening http://localhost:8080.
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[mphilbrick211]

Hi @huyvt-2722, and thanks for this contribution! Please let me know if you have any questions regarding submitting a CLA form. Thanks!

[huyvt-2722]

Hi @mphilbrick211 thank for your reply, I do not have no question