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Thanks for contributing!
We changed the structure of the lang files a bit in #485. Can you grab the latest from the develop branch and update the patch to match that structure? Then, please submit a pull request to the develop branch instead of the master branch.
Also, we don't like to accept languages without unit tests, so can you add unit tests like https://github.com/timrwood/moment/blob/develop/test/lang/en.js?
You can just copy the file and replace it with Vietnamese test conditions.
Closing this issue out, please see the above comment and resubmit with tests to the develop branch