feat: add Vietnamese language support

[vuthehuyht]

Description:

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.13%. Comparing base (31d2431) to head (ae078a9).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #825   +/-   ##
=======================================
  Coverage   87.12%   87.13%           
=======================================
  Files          48       48           
  Lines        1406     1407    +1     
  Branches      297      300    +3     
=======================================
+ Hits         1225     1226    +1     
  Misses        168      168           
  Partials       13       13           

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[brian-smith-tcril]

LGTM!

Vietnamese is listed as a supported language here: https://openedx.atlassian.net/wiki/spaces/COMM/pages/3157524644/Translation+Working+Group#The-following-is-a-table-of-the-latest-list-of-languages-supported--by-the-Translation-Working-Group

and translations exist for Vietnamese in the https://github.com/openedx/openedx-translations/ repo.