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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.13%. Comparing base (31d2431) to head (a60b618).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #821   +/-   ##
=======================================
  Coverage   87.12%   87.13%           
=======================================
  Files          48       48           
  Lines        1406     1407    +1     
  Branches      297      297           
=======================================
+ Hits         1225     1226    +1     
  Misses        168      168           
  Partials       13       13           

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